1. For the five-pointed star (pentagram), inscribed in the circles, find the measures of ∠1 and ∠2.
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-?
3. If ST- ≅ TV-. Explain why ΔSTV is an isosceles triangle