# Sum of Exterior Angles of Polygons

- Author:
- Lindsay Ross, Tim Brzezinski

## TRIANGLE: Move any of the LARGE POINTS anywhere you'd like!

## 1.

What seems to be true about a triangle's exterior angles? Describe what you see.

## 2.

Suppose the **blue angle measures 120 degrees** and the **pink angle measures 140 degrees**.
**
What would the measure of the purple angle be? **

**Note:**For the polygons that follow (quadrilateral, pentagon, hexagon), these applets will work best if the polygon is kept

**CONVEX**. If you don't remember what this term means, click here for a refresher.

## QUADRILATERAL

## 3.

What seems to be true about a quadrilateral's exterior angles? Describe what you see.

## 4.

Suppose the **blue angle measures 120 degrees** and the **pink angle measures 140 degrees **and the **green angle measures 100 degrees**.
**
What would the measure of the purple angle be? **

## PENTAGON

## HEXAGON

## 5.

What can we conclude about a pentagon's 5 exterior angles? What can we conclude about a hexagon's 6 exterior angles? Describe the phenomena you observed.