Chapter 10. Properties of Circles
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1 Chapter 10 Properties of Circles
2 10.1 Use Properties of Tangents Objective: Use properties of a tangent to a circle. Essential Question: how can you verify that a segment is tangent to a circle?
3 Terminology: A is the set of all points in a plane that are equidistant from a given point called the of the circle. A segment whose endpoints are the center and any point on the circle is a. A is a segment whose endpoints are on a circle. A is a chord that contains the center of the circle.
4 Terminology cont. A is a line that intersects a circle in two points. A is a line in the plane of a circle that intersects the circle in exactly one point, called the.
5 Ex.1: Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. a. AC b. AB c. DE d. AE
6 Ex.2: Tell whether the line, ray, or segment is best described as a radius, chord, diameter, secant, or tangent of C. a. DC b. DE c. d. BD AE
7 Ex.3: Use the diagram to find the given lengths. a. Radius of A b. Diameter of A c. Radius of B d. Diameter of B
8 Properties of Tangents Two circles can intersect in two points, one point, or no points. Coplanar circles that intersect in one point are called. Coplanar circles that have a common center are called.
9 A line, ray, or segment that is tangent to two coplanar circles is called a common tangent. Ex.4: Tell how many common tangents the circles have and draw them. a. b. c.
10 Theorem 10.1: In a plane, a line is tangent to a circle if and only if the line is perpendicular to a radius of the circle at its endpoint on the circle. Ex.5: In the diagram, PT is a radius of P. Is ST tangent to P?
11 Ex.6: In the diagram, B is a point of tangency. Find the radius of C. Theorem 10.2: Tangent segments from a common external point are congruent.
12 Ex.7: is tangent to at S and is tangent to RS C RT C at T. Find the value of x. Ex.8: is tangent to Find the value of r. ST Q.
13 Ex.9: In C, DA is tangent at A and DB is tangent at B. Find x. Ex.10: Is tangent to DE C?
14 Ex.11: Find the value of x.
15 Homework: Exercises 10.1 Concepts: #1 28, Regular: #1 29, Honors: #1 31, 35-38
16 10.2 Use Arc Measures Objective: Use angle measures to find arc measures. Essential Question: How do you find the measure of an arc of a circle?
17 Arc Length Use the measure of an arc (in degrees) to find its length (in linear units).
18 minor arc PG major arc PRG semicircle PRT Types of Arcs K G P R K G P R T K P G m PG 180 m PRG 180 m PRT 180 Note that for circle K, two letters are used to name the minor arc, but three letters are used to name the major arc and semicircle. These letters for naming arcs help us trace the set of points in the arc. In this way, there is no confusion about which arc is being considered.
19 Ex.1: Find the measure of each arc of P, where RT is a diameter. a. b. RS RTS c. R ST
20 Adjacent Arcs Two arcs of the same circle are if they have a common endpoint. Postulate: Arc Addition Postulate: The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs.
21 Ex.2: Identify the given arc as a major arc, minor arc, or semicircle, and find the measure of the arc. a. TQ b. Q RT TQ R c. d. e. TS f. QS R ST
22 Congruent Circles and Arcs Two circles are if they have the same radius. Two arcs are if they have the same measure and they are arcs of the same circle or of congruent circles.
23 Ex.3: Tell whether the red arcs are congruent. Explain why or why not. a. b. c.
24 Ex.4: Find the measure of each arc of the circle. a. AED b. AC ACE c. d. BE e. f. AEC CDE
25 Ex.5: Tell whether the red arcs are congruent. Explain why or why not. a. b.
26 Homework: Exercises 10.2 Concepts: #1 19, 22, 23 Regular: #1 19, 22, 23 Honors: #1 19, 22-25
27 10.3 Apply Properties of Chords Objective: Use relationships of arc and chords in a circle. Essential Question: How can you tell if two chords in a circle are congruent?
28 What is a chord? A is a segment with endpoints on a circle. Any chord divides the circle into two arcs. A diameter divides a circle into two semicircles. Any other chord divides a circle into a minor arc and a major arc.
29 Theorem 10.3: In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent. Ex.1: In the diagram, o m JK 80. m FG. Find P Q, FG JK, and
30 Example: Use the diagram of D. o a. If m AB 110, find m BC. o b. If m AC 150, find m AB.
31 Theorem: Bisecting Arcs If one chord is a perpendicular bisector of another chord, then the first chord is a diameter. Theorem: If a diameter of a circle is perpendicular to a chord, then the diameter bisects the chord and its arc.
32 Example: Use the diagram of of AC. E to find the length Example: Find the measure of the indicated arc. CD a. b. DE c. CE
33 Theorem 10.6: In the same circle, or in congruent circles, two chords are congruent if and only if they are equidistant from the center. Example: In the diagram of CU. C, QR = ST = 16. Find
34 Example: Use the diagram of of BF. C to find the length Ex.8: In the diagram of P, PV = PW, QR = 2x + 6, and ST = 3x 1. Find QR.
35 Example: In Find mcd. R, AB o C D and m AB 108.
36 Homework: Exercises 10.3 Concepts: #1 20, 25 Regular: #1 20, 25 Honors: #1 20, 23, 25, 26
37 10.4 Use Inscribed Angles and Polygons Objective: Use inscribed angles of circles. Essential Question: How do you find the measure of an inscribed angle?
38 Inscribed angle: An angle whose vertex is on a circle and whose sides are chords of the circle
39 Intercepted Arc: An arc that is inside an inscribed angle
40 Inscribed Polygon : A polygon that has all of its vertices on a circle
41 Theorem: The measures of an inscribed angle is the measure of its arc. x 2x ADB = 1 2 m AB
42 Example: Find the indicated measure.
43 Example: Find the measure of A and C. 64 m A = 80 m C =
44 Theorem: If two inscribed angles of a circle the same arc, then the angles are. ADB ACBC
45 Circumscribed Circle:
46 Theorem: A triangle is inscribed in a circle iff the is a diameter of the circle. m ABC is a right angle because it inscribes a semicircle.
47 Theorem: A can be inscribed in a circle iff its opposite angles are. m D + m F = 180 m E + m G = 180
48 Example: Decide whether a circle can be circumscribed about the figure.
49 Example: Decide whether a circle can be circumscribed about the figure. 91
50 Example: Find the value of the variables. 44
51 Homework: Exercises 10.4 Concepts: #1 25 Regular: #1 25, Honors: #1 25, 27 29, 34, 35
52 10.5 Apply Other Angle Relationships in Circles. Objective: Find the measures of angles inside or outside a circle. Essential Question: How do you find the measure of an angle formed by two chords that intersect inside a circle?
53 If a and a intersect at a point a circle, then the measure of each angle formed is the measure of its intercepted arc.
54 If two intersect a circle, then the measure of each angle is the of the measures of the arcs intercepted by the angle and its angle.
55 If a and a, two tangents, or two secants intersect of a circle, then the measures formed is the of the measures of the intercepted arcs.
56 Example: Find the measure of each indicated angle or arc. Tangent angle = Arc 2
57 Example: Find the measure of each indicated angle or arc. Inside angle = arc + arc 2 106
58 Example: Find the measure of each indicated angle or arc. big arc little arc Outside angle = 2
59 Example: Find the measure of each indicated Arc angle or arc. Tangent angle = 2
60 Example: Find the measure of each indicated angle or arc. big arc little arc Outside angle =
61 Homework: Exercises 10.5 Concepts: #1 19 Regular: #1 19, Honors: #1 19, 23-26
62 10.6 Find segment lengths in Circles Objective: Find segment lengths in circles. Essential Question: What are some properties of chords, secants, and tangents to a circle?
63 Chords When two chords intersect in the interior of a circle, each chord is divided into two segments that are called.
64 Segments of Chords Theorem: If two chords intersect in the interior of a circle, then 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.
65 Example: Find ML and JK. Example: Find RT and SU.
66 Tangents and Secants A is a segment that contains a chord of a circle, and has exactly one endpoint outside the circle. The part of a secant segment that is outside the circle is called an.
67 Segments of Secants Theorem: If two secant segments share the same endpoint outside a circle, then the product of the lengths of one secant segment and its external segment equals the product of the lengths of the other secant segment and its external segment. Example:
68 Example: What is the value of x? Segments of Secants and Tangents Theorem: If a secant segment and a tangent segment share an endpoint outside a circle, then the product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
69 Example: Find RS. Example: Find AB.
70 Example: Determine which theorem you would use to find x. Then find the value of x.
71 Example: Suppose the Space shuttle is positioned at point S, 150 miles above the Earth. What is the length of ES from the Earth to the shuttle? (The radius of the Earth is about 4000 miles.)
72 Homework: Exercises 10.6 Concepts: #1 18, 20 Regular: #1-18, 20, 22 Honors: #1 18, 20, 22, 24
73 10.7 Write and graph equations of circles. Objective: Write equations of circles in the coordinate plane. Essential Question: What do you need to know to write the standard equation of a circle?
74 Equations of Circles You can write the equation of any circle if you know its radius and the coordinates of its center. Standard Equation of a Circle: The standard equation of a circle with and is:
75 Example: Write the equation of the circle shown. Example: Write the standard equation of a circle with center (0, -9) and radius 4.2.
76 Example: Write the standard equation of the circle with the given center and radius. Example: Center: (0, 0), radius: 2.5 Example: Center: (-2, 5), radius: 7 Example: The point (-5, 6) is on a circle with center (-1, 3). Write the standard equation of the circle.
77 Example: The point (3, 4) is on a circle whose center is (1, 4). Write the standard equation of the circle. Example: The point (-1, 2) is on a circle whose center is (2, 6). Write the standard equation of the circle.
78 Example: The equation of a circle is (x 4) 2 + (y + 3) 2 = 16. Graph the circle.
79 Homework: Exercises 10.7 Concepts: Practice 10.7 Regular: #1 25 all, odd, Honors: #1 33, 36, 37
80 Chapter 10 Test
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