# Angle Sum (Interior & Exterior)

- Author:
- Geeta Mudhar

## Interact with the applet below for a few minutes. Then, answer the questions that follow. Be sure to change the locations of the quadrilateral's BIG BLACK VERTICES each time before you drag the slider!!!

1. When working with the interior angles of the quadrilateral, did any change take place in the measure of the angles?

2. From your observations, what is the sum of the measures of the interior angles of *any quadrilateral?
*

3. When working with the quadrilateral's exterior angles, did any of these transformations change the measures of these exterior angles?

4. From your observations, what is the sum of the measures of the exterior angles of *any quadrilateral? *

Now observe the above applet and answer the following questions

1. Are the exterior angles shown in the above applet in order?

2. Is the sum of angles still be 360?

3. What do you infer from this?