# Congruent Angles: Definition

- Author:
- Tim Brzezinski

The following applet illustrates what it means for two angles to be classified as congruent angles.
Interact with this applet for a few minutes, then answer the questions that follow.

*Be sure to move the***BIG PINK POINTS**around each time before you re-slide the slider.**Questions:**1) What geometric transformation(s) took place in the applet above? List it/them. 2) Did any of these transformations change the measure of the

**original green angle**? 3)

*Cause:*How would you define what it means for angles to be congruent with respect to the geometric transformations you listed in (1) above? 4)

*Effect*: If we know that two angles are congruent, what can we consequently conclude about their measures?