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## 10.6 More Angle Arc Theorems

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**10.6 More Angle Arc Theorems**After studying this section, you will be able to recognize congruent inscribed and tangent-chord angles; determine the measure of an angle inscribed in a semicircle and apply the relationship between the measures of a tangent-tangent angles and its minor arc..**A**C B O O E D Theorem If two inscribed or tangent chord angles intercept the same arc, then they are congruent. Theorem If two inscribed or tangent-chord angles intercept congruent arcs, then they are congruent.**Theorem An angle inscribed in a semicircle is a right**angle. A C B**Theorem The sum of the measures of a tangent- tangent**angle and its minor arc is 180. Minor arc DE = 130 find the measure of angle F. D O 130 F E**Example 1**Given circle O N Conclusions Triangle LVE is similar to triangle NSE L E O S V**Example 2**In circle O, segment BC is a diameter and the radius of the circle is 20.5 mm. Chord AC has a length of 40 mm. Find AB. A B O C**Example 3**B A Given: circle O with tangent at B D C O Prove:**Summary**Summarize what you have learned in this lesson. Homework: worksheet