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More Angle-Arc Theorems. Lesson 10.6. Congruent Inscribed & Tangent-Chord Angles. Theorem 89: If two inscribed or tangent-chord angles intercept the same arc, then they are congruent. Congruent Inscribed & Tangent-Chord Angles.

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## More Angle-Arc Theorems

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**More Angle-Arc Theorems**Lesson 10.6**Congruent Inscribed & Tangent-Chord Angles**Theorem 89: If two inscribed or tangent-chord angles intercept the same arc, then they are congruent.**Congruent Inscribed & Tangent-Chord Angles**Theorem 90: If two inscribed or tangent-chord angles intercept congruent arcs, then they are congruent.**Angles Inscribed in Semi-Circles**Theorem 91: An angle inscribed in a semicircle is a right angle. Since the measure of an inscribed angle is one-half the measure of its intercepted arc, and a semi-circle is 180º, C is 90º.**Special Theorem about Tangent-Tangent Angles**Theorem 92: The sum of the measures of a tangent-tangent angle and its minor arc is 180º.**A is inscribed in a semicircle, it is a right angle.**• Use the Pythagorean Theorem to solve. • (AB)2 + (AC)2 = (BC)2 • (AB)2 + 402 = 412 • AB = 9 mm**Circle O**• V S • L N • ΔLVE ~ ΔNSE • EV = ELSE EN • EV • EN = EL • SE Given If two inscribed s intercept the same arc, they are . Same as 2 AA (2, 3) Ratios of corresponding sides of ~ triangles are =. Means-Extremes Products Theorem.

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