The example below shows a rotation about the origin of triangle ABC. [br]Move the slider to see how triangle A'B'C' rotates. [br]

1. How does the rotation affect the triangle A'B'C'? [br][br]2. Is triangle ABC and triangle A'B'C' always congruent?[br][br]Challenge: Is there a way reflections could be used to get triangle ABC on A'B'C'.