# Unit 10 Geometry Circles. NAME Period

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1 Unit 10 Geometry Circles NAME Period 1

2 Geometry Chapter 10 Circles ***In order to get full credit for your assignments they must me done on time and you must SHOW ALL WORK. *** 1. (10-1) Circles and Circumference Day 1- Pages , even 2. (10-2) Angles and Arcs Day 1- Pages , even, (10-2) Angles and Arcs Day Practice WS 4. (10-3) Arcs and Chords Day 1- Pages and odd 5. (10-3) Arcs and Chords Day Practice WS 6. (10-4) Inscribed Angles Day 1- Pages , 13-16, 22, (10-4) Inscribed Angles Day Practice WS 8. (10-5) Tangents Day 1 Pages , (10-5) Tangents Day Practice WS 10. (10-6) Secants, Tangents, and Angle Measures Day 1 Pages even 11. (10-6) Secants, Tangents, and Angle Measures Day Practice WS 12. Chapter 10 Review 2

3 Section 10 1: Circles and Circumference Notes Circle a set of equidistant from a given point called the of the circle Chord: any with endpoints that are on the Diameter: Radius: Circumference: Example #1: a.) Name the circle. b.) Name a radius of the circle. c.) Name a chord of the circle. d.) Name a diameter of the circle. e.) If AC = 18, find EC. f.) If DE = 3, find AE. 3

4 Example #2: a.) Find C if r = 13 inches. b.) Find C if d = 6 millimeters. b.) Find d and r to the nearest hundredth if C = 65.4 feet. CRITICAL THINKING In the figure, the radius of circle A is twice the radius of circle B and four times the radius of circle C. If the sum of the circumferences of the three circles is 42π, find the measure of AC. 4

5 Section 10 2: Angles and Arcs Notes Angles and Arcs A has the center of the circle as its, and its sides contain two of the circle. Arcs of a Circle Minor Arc Arc degree measure equals the measure of the angle and is than. Major Arc Arc degree measure equals 360 the measure of the arc and is than

6 Semicircle Arc degree measure equals or. Example #1: Refer to circle T. a.) Find m RTS. b.) Find m QTR. Example #2: In circle P, m NPM = 46, PL bisects KPM, and OP KN. Find each measure. a.) m OK b.) m LM c.) m JKO 6

7 Arc Length Part of the. Example #3: In circle B, AC = 9 and m ABD = 40. Find the length of AD. 7

8 CRITICAL THINKING The circles at the right are point E as their center. If m<1 = 42. Determine whether arc AB is congruent to arc CD. Explain. concentric circles that both have 8

9 Arcs and Chords Section 10 3: Arcs and Chords Notes The of a chord are also endpoints of an. Theorem 10.2: In a circle, two arcs are congruent if and only if their corresponding are congruent. Inscribed and Circumscribed The chords of arcs can form a. Quadrilateral ABCD is an polygon because all of its lie on the circle. Circle E is about the polygon because it contains all of the vertices of the. Theorem 10.3: In a circle, if the diameter (or radius) is to a chord, then it the chord and its arc. 9

10 Example #1: Circle W has a radius of 10 centimeters. Radius WL is perpendicular to chord HK, which is 16 centimeters long. a.) If mhl = 53, find mmk. b.) Find JL. Theorem 10.4: In a circle, two are congruent if and only if they are from the center. Example #2: Chords EF and GH are equidistant from the center. If the radius of circle P is 15 and EF = 24, find PR and 10

11 CRITICAL THINKING A diameter of circle P has endpoints A and B. Radius PQ is perpendicular to AB. Chord DE bisects PQ and is parallel to AB. Does DE = ½ (AB)? Explain. (Hint: Draw a picture!) 11

12 Inscribed Angles Section 10 4: Inscribed Angles Notes An inscribed angle is an angle that has its on the circle and its contained in of the circle. Theorem 10.5: If an angle is in a circle, then the measure of the angle equals the measure of its intercepted arc (or the measure of the arc is the measure of the inscribed angle). Example #1: In circle O, mab = 140, mbc = 100, and mad = mdc. Find the measures of the numbered angles. 12

13 Theorem 10.6: If two inscribed angles of a (or congruent circles) intercept arcs or the same arc, then the angles are. Angles of Inscribed Polygons Theorem 10.7: If an inscribed angle intercepts a semicircle, the angle is a angle. Example #2: Triangles TVU and TSU are inscribed in circle P, with measure of each numbered angle if m 2 x 9 = + and m 4 = 2x + 6. VU SU. Find the 13

14 Example #3: Quadrilateral ABCD is inscribed in circle P. If m B 80 find m A and m D. = and m C = 40, Theorem 10.8: If a quadrilateral is in a circle, then its angles are. 14

15 CRITICAL THINKING A trapezoid ABCD is inscribed in circle O. Explain how you can verify that ABCD must be an isosceles trapezoid. 15

16 Tangents Section 10 5: Tangents Notes Tangent a line in the plane of a that intersects the circle in exactly one. The point of intersection is called the. Theorem 10.9: If a line is to a circle, then it is to the drawn to the point of. Example #1: RS is tangent to circle Q at point R. Find y. 16

17 Theorem 10.10: If a is perpendicular to a radius of a circle at its on the circle, then the line is to the circle. Example #2: Determine whether the given segments are tangent to the given circles. a.) BC b.) WE Theorem 10.11: If two from the same exterior point are to a circle, then they are. 17

18 Example #3: Find x. Assume that segments that appear tangent to circles are tangent. Example #4: Triangle HJK is circumscribed about circle G. Find the perimeter of HJK if NK = JL

19 CRITICAL THINKING AE is a tangent. If AD = 12 and FE = 18, how long is AE to the nearest tenth unit? 19

20 Section 10 6: Secants, Tangents, and Angle Measures Notes Secant a line that intersects a circle in exactly points Theorem 10.12: (Secant-Secant Angle) Angle) Theorem 10.13: (Secant-Tangent Theorem 10.14: Two Secants Secant-Tangent Two Tangents Example #1: Find m 3 and m 4 if mfg = 88 and meh =

21 Example #2: Find m RPS if mpt = 144 and mts = 136. Example #3: Find x. Example #4: Use the figure to find the measure of the bottom arc. Example #5: Find x. 21

22 CRITICAL THINKING In the figure, <3 is a central angle. List the numbered angles in order from greatest measure to least measure. Explain your reasoning. 22

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