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Chapter 12.3 Inscribed Angles

Chapter 12.3 Inscribed Angles. Vocabulary. Theorem 12.9 Inscribed Angle Theorem. The measure of an inscribed angle is half the measure of its intercepted arc. C. A. B. Example #1. Find X. X. 138. Corollaries to the Inscribed Angle Theorem.

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Chapter 12.3 Inscribed Angles

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  1. Chapter 12.3 Inscribed Angles

  2. Vocabulary

  3. Theorem 12.9 Inscribed Angle Theorem • The measure of an inscribed angle is half the measure of its intercepted arc C A B

  4. Example #1 Find X X 138

  5. Corollaries to the Inscribed Angle Theorem • 1) Two inscribed angles that intercept the same arc are congruent • 2) An angle inscribed in a semicircle is a right angle • 3) The opposite angles of a quadrilateral inscribed in a circle are supplementary

  6. Theorem 12.10 • The measure of an angle formed by a tangent and a chord is half the measure of the intercepted arc

  7. Example #2

  8. Classwork • Pgs 681-682 #1-22

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