I have no idea how to start this, let alone finish it. The worst part is I have to solve it by the end of tonight! Would one of you guys please help me?
Oh yeah: can I assume triangle BST is an equilateral triangle?
Solve using a two column proof:
Given: Line segment AS is parallel to line segment BT;
The measure of angle 4 is equal to the measure of angle 5
Prove: Ray SA bisects angle BSR