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**Chapter 12.3 Inscribed Angles**

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Vocabulary

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**Theorem 12.9 Inscribed Angle Theorem**

The measure of an inscribed angle is half the measure of its intercepted arc C A B

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Example #1 Find X X 138

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**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

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

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Example #2

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Classwork Pgs #1-22

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