Name Date. Inscribed Angles and Polygons For use with Exploration arcs? How are the angles of an inscribed quadrilateral related to each other?
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1 Name ate 10.4 Inscribed ngles and Polygons For use with Exploration 10.4 Essential Question How are inscribed angles related to their intercepted arcs? How are the angles of an inscribed quadrilateral related to each other? n inscribed angle is an angle whose vertex is on a circle and whose sides contain chords of the circle. n arc that lies between two lines, rays, or segments is called an intercepted arc. polygon is an inscribed polygon when all its vertices lie on a circle. central angle intercepted arc 1 EXPLORTION: Inscribed ngles and entral ngles Go to igideasmath.com for an interactive tool to investigate this exploration. Work with a partner. Use dynamic geometry software. R P inscribed angle O Q a. onstruct an inscribed angle in a circle. Sample Then construct the corresponding central angle. b. Measure both angles. How is the inscribed angle related to its intercepted arc? c. Repeat parts (a) and (b) several times. Record your results in the following table. Write a conjecture about how an inscribed angle is related to its intercepted arc. Measure of Inscribed ngle Measure of entral ngle Relationship opyright ig Ideas Learning, LL ll rights reserved. 293
2 Name ate 10.4 Inscribed ngles and Polygons (continued) 2 EXPLORTION: Quadrilateral with Inscribed ngles Go to igideasmath.com for an interactive tool to investigate this exploration. Work with a partner. Use dynamic geometry software. a. onstruct a quadrilateral with each Sample vertex on a circle. b. Measure all four angles. What relationships do you notice? E c. Repeat parts (a) and (b) several times. Record your results in the following table. Then write a conjecture that summarizes the data. ngle Measure 1 ngle Measure 2 ngle Measure 3 ngle Measure 4 ommunicate Your nswer 3. How are inscribed angles related to their intercepted arcs? How are the angles of an inscribed quadrilateral related to each other? 4. Quadrilateral EFGH is inscribed in, and m E = 80. What is m G? Explain. 294 opyright ig Ideas Learning, LL ll rights reserved.
3 Name ate 10.4 Notetaking with Vocabulary For use after Lesson 10.4 In your own words, write the meaning of each vocabulary term. inscribed angle intercepted arc subtend inscribed polygon circumscribed circle ore oncepts Inscribed ngle and Intercepted rc n inscribed angle is an angle whose vertex is on a circle and whose sides contain chords of the circle. n arc that lies between two lines, rays, or segments is called an intercepted arc. If the endpoints of a chord or arc lie on the sides of an inscribed angle, then the chord or arc is said to subtend the angle. inscribed angle intercepts. subtends. subtends. intercepted arc Theorems Theorem Measure of an Inscribed ngle Theorem The measure of an inscribed angle is one-half the measure of its intercepted arc. m = 1 m 2 opyright ig Ideas Learning, LL ll rights reserved. 295
4 Name ate 10.4 Notetaking with Vocabulary (continued) Theorem Inscribed ngles of a ircle Theorem If two inscribed angles of a circle intercept the same arc, then the angles are congruent. ore oncepts Inscribed Polygon polygon is an inscribed polygon when all its vertices lie on a circle. The circle that contains the vertices is a circumscribed circle. inscribed polygon circumscribed circle Theorems Theorem Inscribed Right Triangle Theorem If a right triangle is inscribed in a circle, then the hypotenuse is a diameter of the circle. onversely, if one side of an inscribed triangle is a diameter of the circle, then the triangle is a right triangle and the angle opposite the diameter is the right angle. m = 90 if and only if is a diameter of the circle. Theorem Inscribed Quadrilateral Theorem quadrilateral can be inscribed in a circle if and only if its opposite angles are supplementary. E F G, E, F, and G lie on if and only if m + m F = m E + m G = opyright ig Ideas Learning, LL ll rights reserved.
5 Name ate 10.4 Notetaking with Vocabulary (continued) Extra Practice In Exercises 1 5, use the diagram to find the indicated measure. 1. m 2. m m N 5. m 6. Name two pairs of congruent angles. 7. Find the value of each variable. m 100 n 65 opyright ig Ideas Learning, LL ll rights reserved. 297
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10.4 Inscribed ngles and Polygons ssential uestion How are inscribed angles related to their intercepted arcs? How are the angles of an inscribed quadrilateral related to each other? n inscribed angle
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