# Complementary Angles Investigation

- Author:
- Mary Foster, Tim Brzezinski

- Topic:
- Angles

In the applet below, the

**pink angle**and the**blue angle**are said to be**complementary angles**. Interact with this applet for a minute or two, and answer the questions that appear below it.What happens when you slide the Pink Slider?

## 2.

In the applet above, the **blue angle** is said to be a * complement *of the

**pink angle**, and vice versa. Given this information, determine the

*complement*of a 40 degree angle.

## 3.

What is the complement of a 1-degree angle?

## 4. Challenge:

What angle measure has a complement whose measure is equal to itself?