1. For the five-pointed star (pentagram), inscribed in the circles, find the measures of ∠1 and ∠2.
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2. AB- is the common chord ⊗O and ⊗Q. If AB= 12 and each circle has a radius of length 10, how long is OQ-?
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3. If ST- ≅ TV-. Explain why ΔSTV is an isosceles triangle
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