1. For the five-pointed star (pentagram), inscribed in the circles, find the measures of ∠1 and ∠2.
![1766_Pentagram.png](https://secure.tutorsglobe.com/CMSImages/1766_Pentagram.png)
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-?
![834_Common Chord.png](https://secure.tutorsglobe.com/CMSImages/834_Common%20Chord.png)
3. If ST- ≅ TV-. Explain why ΔSTV is an isosceles triangle
![2039_Isosceless Triangle.png](https://secure.tutorsglobe.com/CMSImages/2039_Isosceless Triangle.png)