# Understand and Apply Theorems about Circles

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1 UNIT 4: CIRCLES AND VOLUME This unit investigates the properties of circles and addresses finding the volume of solids. Properties of circles are used to solve problems involving arcs, angles, sectors, chords, tangents, and secants. Volume formulas are derived and used to calculate the volumes of cylinders, pyramids, cones, and spheres. Understand and Apply Theorems about Circles MGSE9-1.G.C.1 Understand that all circles are similar. MGSE9-1.G.C. Identify and describe relationships among inscribed angles, radii, chords, tangents, and secants. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle. MGSE9-1.G.C. Construct the inscribed and circumscribed circles of a triangle, and prove properties of angles for a quadrilateral inscribed in a circle. MGSE9-1.G.C.4 Construct a tangent line from a point outside a given circle to the circle. KEY IDEAS 1. A circle is the set of points in a plane equidistant from a given point, which is the center of the circle. All circles are similar.. A radius is a line segment from the center of a circle to any point on the circle. The word radius is also used to describe the length, r, of the segment. AB is a radius of circle A.. A chord is a line segment whose endpoints are on a circle. BC is a chord of circle A. Page 80 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

2 4. A diameter is a chord that passes through the center of a circle. The word diameter is also used to describe the length, d, of the segment. BC is a diameter of circle A. Unit 4: Circles and Volume 5. A secant line is a line that is in the plane of a circle and intersects the circle at exactly two points. Every chord lies on a secant line. BC is a secant line of circle A. 6. A tangent line is a line that is in the plane of a circle and intersects the circle at only one point, the point of tangency. DF is tangent to circle A at the point of tangency, point D. Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 81 of 18

3 7. If a line is tangent to a circle, the line is perpendicular to the radius drawn to the point of tangency. DF is tangent to circle A at point D, so AD DF. 8. Tangent segments drawn from the same point are congruent. In circle A, } CG } BG. 9. Circumference is the distance around a circle. The formula for circumference C of a circle is C = πd, where d is the diameter of the circle. The formula is also written as C = πr, where r is the length of the radius of the circle. π is the ratio of circumference to diameter of any circle. 10. An arc is a part of the circumference of a circle. A minor arc has a measure less than 180. Minor arcs are written using two points on a circle. A semicircle is an arc that measures exactly 180. Semicircles are written using three points on a circle. This is done to show which half of the circle is being described. A major arc has a measure greater than 180. Major arcs are written with three points to distinguish them from the corresponding minor arc. In circle A, CB is a minor arc, CBD is a semicircle, and CDB is a major arc. Page 8 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

4 11. A central angle is an angle whose vertex is at the center of a circle and whose sides are radii of the circle. The measure of a central angle of a circle is equal to the measure of the intercepted arc. APB is a central angle for circle P, and AB is the intercepted arc. Unit 4: Circles and Volume m APB = mab 1. An inscribed angle is an angle whose vertex is on a circle and whose sides are chords of the circle. The measure of an angle inscribed in a circle is half the measure of the intercepted arc. For circle D, ABC is an inscribed angle, and AC is the intercepted arc. m ABC = 1 mac = 1 m ADC m ADC = mac =( m ABC) Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 8 of 18

5 1. A circumscribed angle is an angle formed by two rays that are each tangent to a circle. These rays are perpendicular to radii of the circle. In circle O, the measure of the circumscribed angle is equal to 180 minus the measure of the central angle that forms the intercepted arc. The measure of the circumscribed angle can also be found by using the measures of two intercepted arcs [see Key Idea 18]. m ABC = 180 m AOC 14. When an inscribed angle intercepts a semicircle, the inscribed angle has a measure of 90. For circle O, RPQ intercepts semicircle RSQ as shown. m RPQ = 1 mrsq = 1 (180 ) 90 = Page 84 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

6 15. The measure of an angle formed by a tangent and a chord with its vertex on the circle is half the measure of the intercepted arc. AB is a chord for the circle, and BC is tangent to the circle at point B. So, ABC is formed by a tangent and a chord. Unit 4: Circles and Volume m ABC = 1 mab 16. When two chords intersect inside a circle, two pairs of vertical angles are formed. The measure of any one of the angles is half the sum of the measures of the arcs intercepted by the pair of vertical angles. m ABE = 1 mae + mcd m ABD = 1 mafd + mec 17. When two chords intersect inside a circle, the product of the lengths of the segments of one chord is equal to the product of the lengths of the segments of the other chord. AB BC = EB BD Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 85 of 18

7 18. Angles outside a circle can be formed by the intersection of two tangents (circumscribed angle), two secants, or a secant and a tangent. For all three situations, the measure of the angle is half the difference of the measure of the larger intercepted arc and the measure of the smaller intercepted arc. m ABD = 1 mafd mad m ACE = 1 mae mbd m ABD = 1 mad mac 19. When two secant segments intersect outside a circle, part of each secant segment is a segment formed outside the circle. The product of the length of one secant segment and the length of the segment formed outside the circle is equal to the product of the length of the other secant segment and the length of the segment formed outside the circle. EC DC = AC BC 0. When a secant segment and a tangent segment intersect outside a circle, the product of the length of the secant segment and the length of the segment formed outside the circle is equal to the square of the length of the tangent segment. DB CB = AB Page 86 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

8 1. An inscribed polygon is a polygon whose vertices all lie on a circle. This diagram shows a triangle, a quadrilateral, and a pentagon each inscribed in a circle. Unit 4: Circles and Volume. In a quadrilateral inscribed in a circle, the opposite angles are supplementary. m ABC + m ADC = 180 m BCD + m BAD = 180. When a triangle is inscribed in a circle, the center of the circle is the circumcenter of the triangle. The circumcenter is equidistant from the vertices of the triangle. Triangle ABC is inscribed in circle Q, and point Q is the circumcenter of the triangle. AQ = BQ = CQ Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 87 of 18

9 4. An inscribed circle is a circle enclosed in a polygon, where every side of the polygon is tangent to the circle. Specifically, when a circle is inscribed in a triangle, the center of the circle is the incenter of the triangle. The incenter is equidistant from the sides of the triangle. Circle Q is inscribed in triangle ABC, and point Q is the incenter of the triangle. Notice also that the sides of the triangle form circumscribed angles with the circle. REVIEW EXAMPLES 1. PNQ is inscribed in circle O and mpq = 70. a. What is the measure of POQ? b. What is the relationship between POQ and PNQ? c. What is the measure of PNQ? Page 88 of 18 Solution: a. The measure of a central angle is equal to the measure of the intercepted arc. m POQ = mpq = 70. b. POQ is a central angle that intercepts PQ. PNQ is an inscribed angle that intercepts PQ. The measure of the central angle is equal to the measure of the intercepted arc. The measure of the inscribed angle is equal to one-half the 1 measure of the intercepted arc. So m POQ = mpq and m PNQ = m PQ, so m POQ = m PNQ. c. From part (b), m POQ = m PNQ Substitute: 70 = m PNQ Divide: 5 = m PNQ Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

10 . In circle P below, AB is a diameter. If m APC = 100, find the following: a. m BPC b. m BAC c. mbc d. mac Solution: a. APC and BPC are supplementary, so m BPC = 180 m APC, so m BPC = = 80. b. BAC is an angle in APC. The sum of the measures of the angles of a triangle is 180. For APC: m APC + m BAC + m ACP = 180 You are given that m APC = 100. Substitute: m BAC + m ACP = 180 Subtract 100 from both sides: m BAC + m ACP = 80 Because two sides of APC are radii of the circle, APC is an isosceles triangle. This means that the two base angles are congruent, so m BAC = m ACP. Substitute: m BAC for m ACP: m BAC + m BAC = 80 Add: m BAC = 80 Divide: m BAC = 40 You could also use the answer from part (a) to solve for m BAC. Part (a) shows m BPC = 80. Because the central angle measure is equal to the measure of the intercepted arc, m BPC = mbc = 80. Because an inscribed angle is equal to one-half the measure of the intercepted arc, m BAC = 1 mbc. By substitution: m BAC = 1 (80 ) Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 89 of 18

11 Therefore, m BAC = 40. c. BAC is an inscribed angle intercepting BC. The intercepted arc is twice the measure of the inscribed angle. mbc =m BAC From part (b), m BAC = 40. Substitute: mbc = 40 mbc =80 You could also use the answer from part (a) to solve. Part (a) shows m BPC = 80. Because BPC is a central angle that intercepts BC, m BPC = mbc = 80. d. APC is a central angle intercepting AC. The measure of the intercepted arc is equal to the measure of the central angle. mac = m APC You are given m APC = 100. Substitute: mac =100. In circle P below, DG is a tangent. AF = 8, EF = 6, BF = 4, and EG = 8. Find CF and DG. Solution: First, find CF. Use the fact that CF is part of a pair of intersecting chords. AF CF = EF BF 8 CF = CF = 4 CF = Page 90 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

12 Next, find DG. Use the fact that DG is tangent to the circle. 8 EG BG = DG = DG 8 18 = DG 144 = DG ±1= DG 1 = DG (since length cannot be negative) CF = and DG = In this circle, AB is tangent to the circle at point B, AC is tangent to the circle at point C, and point D lies on the circle. What is m BAC? Solution: Method 1 First, find the measure of angle BOC. Angle BDC is an inscribed angle, and angle BOC is a central angle. m BOC = m BDC = 48 = 96 Angle BAC is a circumscribed angle. Use the measure of angle BOC to find the measure of angle BAC. m BAC = 180 m BOC = = 84 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 91 of 18

13 Method Angle BDC is an inscribed angle. First, find the measures of BC and BDC. m BDC = 1 mbc 48 = 1 mbc 48 = mbc 96 = mbc mbdc = 60 mbc = = 64 Angle BAC is a circumscribed angle. Use the measures of BC and BDC to find the measure of angle BAC. m BAC = 1 mbdc mbc = = =84 Page 9 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

14 SAMPLE ITEMS 1. Circle P is dilated to form circle P. Which statement is ALWAYS true? A. The radius of circle P is equal to the radius of circle P. B. The length of any chord in circle P is greater than the length of any chord in circle P. C. The diameter of circle P is greater than the diameter of circle P. D. The ratio of the diameter to the circumference is the same for both circles. Correct Answer: D. In the circle shown, BC is a diameter and mab = 10. What is the measure of ABC? A. 15 B. 0 C. 60 D. 10 Correct Answer: B Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 9 of 18

15 Find Arc Lengths and Areas of Sectors of Circles MGSE9-1.G.C.5 Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector. KEY IDEAS 1. Circumference is the distance around a circle. The formula for the circumference, C, of a circle is C = πr, where r is the length of the radius of the circle.. Area is a measure of the amount of space a circle covers. The formula for the area, A, of a circle is A = πr, where r is the length of the radius of the circle.. Arc length is a portion of the circumference of a circle. To find the length of an arc, divide the number of degrees in the central angle of the arc by 60, and then multiply that amount by the circumference of the circle. The formula for the arc πrθ length, s, is s =, where θ is the degree measure of the central angle and r is 60 the radius of the circle. Important Tip Do not confuse arc length with the measure of the arc in degrees. Arc length depends on the size of the circle because it is part of the circumference of the circle. The measure of the arc is independent of (does not depend on) the size of the circle. One way to remember the formula for arc length: arc length = fraction of the circle circumference = s = πrθ 60. Page 94 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

16 4. A sector of a circle is the region bounded by two radii of a circle and the resulting arc between them. To find the area of a sector, divide the number of degrees in the central angle of the arc by 60, and then multiply that amount by the area of the circle. The formula for area of sector = πr θ, where θ is the degree measure of the 60 central angle and r is the radius of the circle. Important Tip One way to remember the formula for area of a sector: area of a sector = fraction of the circle area = θ π r. 60 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 95 of 18

17 REVIEW EXAMPLES 1. Circles A, B, and C have a central angle measuring 100. The length of each radius and the length of each intercepted arc are shown. a. What is the ratio of the radius of circle B to the radius of circle A? b. What is the ratio of the length of the intercepted arc of circle B to the length of the intercepted arc of circle A? c. Compare the ratios in parts (a) and (b). d. What is the ratio of the radius of circle C to the radius of circle B? e. What is the ratio of the length of the intercepted arc of circle C to the length of the intercepted arc of circle B? f. Compare the ratios in parts (d) and (e). g. Based on your observations of circles A, B, and C, what conjecture can you make about the length of the arc intercepted by a central angle and the radius? h. What is the ratio of arc length to radius for each circle? Page 96 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

18 Solution: a. Divide the radius of circle B by the radius of circle A: circle B circle A = b. Divide the length of the intercepted arc of circle B by the length of the intercepted arc of circle A: c. The ratios are the same π = 50π 5 9 π 9 9 5π = 7 10 circle C d. Divide the radius of circle C by the radius of circle B: circle B = = 6 5 e. Divide the length of the intercepted arc of circle C by the length of the 0 π intercepted arc of circle B: = 0π π = 6 5 π 9 f. The ratios are the same. g. When circles, such as circles A, B, and C, have the same central angle measure, the ratio of the lengths of the intercepted arcs is the same as the ratio of the radii. 5 π h. Circle A: π π 97 = 5 6 = 5 9 Unit 4: Circles and Volume Circle B: Circle C: 50 π 9 π π 10 = = π π π 1 = 0 6 = 5 9 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 97 of 18

19 . Circle A is shown. If x = 50, what is the area of the shaded sector of circle A? Solution: To find the area of the sector, divide the measure of the central angle of the arc in degrees by 60, and then multiply that amount by the area of the circle. The arc measure, x, is equal to the measure of the central angle, θ. The formula for the area of a circle is A = πr. πr θ A = sector Area of sector of a circle with radius r and central angle θ in 60 degrees 50π(8) A = sector 60 Substitute 50 for θ and 8 for r. 5π(64) A = sector 6 Rewrite the fraction and the power. 0π A = sector 6 Multiply. 80π A = sector 9 Rewrite. The area of the sector is 80 π 9 square meters. Page 98 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

20 SAMPLE ITEMS 1. Circle E is shown. What is the length of CD? 9 A. π 7 yd. 9 B. π yd. 6 9 C. π yd. 9 D. π yd. Correct Answer: C Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 99 of 18

21 . Circle Y is shown. What is the area of the shaded part of the circle? 57 A. π cm 4 15 B. π cm C. π cm 8 51 D. π cm 8 Correct Answer: D Page 100 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

22 . The spokes of a bicycle wheel form 10 congruent central angles. The diameter of the circle formed by the outer edge of the wheel is 18 inches. Unit 4: Circles and Volume What is the length, to the nearest 0.1 inch, of the outer edge of the wheel between two consecutive spokes? A. 1.8 inches B. 5.7 inches C. 11. inches D. 5.4 inches Correct Answer: B Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 101 of 18

23 Explain Volume Formulas and Use Them to Solve Problems MGSE9-1.G.GMD.1 Give informal arguments for geometric formulas. a. Give informal arguments for the formulas of the circumference of a circle and area of a circle using dissection arguments and informal limit arguments. b. Give informal arguments for the formula of the volume of a cylinder, pyramid, and cone using Cavalieri s principle. MGSE9-1.G.GMD. Give an informal argument using Cavalieri s principle for the formulas for the volume of a sphere and other solid figures. MGSE9-1.G.GMD. Use volume formulas for cylinders, pyramids, cones, and spheres to solve problems. KEY IDEAS 1. The volume of a figure is a measure of how much space it takes up. Volume is a measure of capacity.. The formula for the volume of a cylinder is V = πr h, where r is the radius and h is the height. The volume formula can also be given as V = Bh, where B is the area of the base. In a cylinder, the base is a circle and the area of a circle is given by A = πr. Therefore, V = Bh = πr h.. When a cylinder and a cone have congruent bases and equal heights, the volume of exactly three cones will fit into the cylinder. So, for a cone and cylinder that have the same radius r and height h, the volume of the cone is one-third of the volume of the cylinder. The formula for the volume of a cone is V = 1 πr h, where r is the radius and h is the height. Page 10 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

24 4. The formula for the volume of a pyramid is V = 1 Bh, where B is the area of the base and h is the height. 5. The formula for the volume of a sphere is V = 4 π r, where r is the radius. 6. Cavalieri s principle states that if two solids are between parallel planes and all cross sections at equal distances from their bases have equal areas, the solids have equal volumes. For example, this cone and this pyramid have the same height and the cross sections have the same area, so they have equal volumes. Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 10 of 18

25 REVIEW EXAMPLES 1. What is the volume of the cone shown below? Solution: The diameter of the cone is 16 cm. So the radius is 16 cm = 8 cm. Use the Pythagorean theorem, a + b = c, to find the height of the cone. Substitute 8 for b and 17 for c and solve for a: a +8 =17 a + 64 =89 a =5 a =15 The formula for the volume of a cone is V = 1 πr h. Substitute 8 for r and 15 for h: V = 1 πr h = 1 π(8) (15) The volume is 0π cm.. A sphere has a radius of feet. What is the volume of the sphere? Solution: The formula for the volume of a sphere is V = 4 πr. Substitute for r and solve. V = 4 πr V = 4 π () V = 4 π (7) V =6π ft Page 104 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

26 . A cylinder has a radius of 10 cm and a height of 9 cm. A cone has a radius of 10 cm and a height of 9 cm. Show that the volume of the cylinder is three times the volume of the cone. Solution: The formula for the volume of a cylinder is V = πr h. Substitute 10 for r and 9 for h: V = πr h = π(10) (9) = π(100)(9) = 900π cm The formula for the volume of a cone is V = 1 πr h. Substitute 10 for r and 9 for h: V = 1 πr h = 1 π (10) (9) = 1 π (100)(9) =00π cm Divide: 900π 00π = Unit 4: Circles and Volume Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 105 of 18

27 4. Cylinder A and Cylinder B are shown below. What is the volume of each cylinder? Solution: To find the volume of Cylinder A, use the formula for the volume of a cylinder, which is V = πr h. Divide the diameter by to find the radius: 10 = 5. Substitute 5 for r and 1 for h: V Cylinder A = πr h = π (5) (1) = π (5)(1) = 00π m 94 m Notice that Cylinder B has the same height and the same radius as Cylinder A. The only difference is that Cylinder B is slanted. For both cylinders, the cross section at every plane parallel to the bases is a circle with the same area. By Cavalieri s principle, the cylinders have the same volume; therefore, the volume of Cylinder B is 00π m, or about 94 m. 10 m 10 m 10 m 1 m 10 m 1 m Cylinder A Cylinder B Page 106 of 18 Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents

28 SAMPLE ITEMS 1. Jason constructed two cylinders using solid metal washers. The cylinders have the same height, but one of the cylinders is slanted as shown. Which statement is true about Jason s cylinders? A. The cylinders have different volumes because they have different radii. B. The cylinders have different volumes because they have different surface areas. C. The cylinders have the same volume because each of the washers has the same height. D. The cylinders have the same volume because they have the same cross-sectional area at every plane parallel to the bases. Correct Answer: D. What is the volume of a cylinder with a radius of in. and a height of 9 in.? 81 A. π in. 7 B. π in. 4 7 C. π in. 8 9 D. π 4 in. Correct Answer: A Georgia Milestones Geometry EOC Study/Resource Guide for Students and Parents Page 107 of 18

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