Play with this applet to learn how to find the missing angle in the triangle. If you need help, scroll to the bottom of this page.

Duane Habecker, Created with GeoGebra

# Self-Check

Q1: What is the measure of the missing angle in this triangle?

[show answer]

## 110°

Q2: What is the measure of the missing angle in this triangle?

[show answer]

## 40°

Q3: What is the measure of the missing angle in this triangle?

[show answer]

## 31°

## HELP

*Add the two given angles. Then subtract the sum from 180° to find the missing angle.*