ABCD is an isosceles trapezoid. Explore the given theorems by dragging A, B, or C to change the trapezoid. [br]1. How are the base angles related?[br]2. How are the legs related?[br]3. How are the diagonals related?[br]4. Can you find any other angles that must be congruent? Hint: Use the diagonals as sides of the angles. Remember your theorems on parallel lines cut by transversals.