If two angles are supplementary and you know one of the angles, what is the other angle? Use this applet to find out. Scroll to the bottom of the page if you need a hint.

Duane Habecker, Created with GeoGebra

# Self-Check

Q1: What is the measure of the missing angle?

[show answer]

## 128°

Q2: What is the measure of the missing angle?

[show answer]

## 50°

Q3: What is the measure of the missing angle?

[show answer]

## 101°

## Help:

*Since the two angles are supplementary, their sum is 180°. To find the missing angle, subtract the given angle from 180°. The result is the missing angle.*