Angle Labels and Measures

Front

What is the measure of a right angle?

Back

90 degrees.

Front

What is the measure of an acute angle?

Back

An acute angle is less than 90 degrees.

Front

What is the measure of an obtuse angle?

Back

An obtuse angle is greater than 90 degrees but less than 180 degrees.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

What is the relationship between complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

How do you find the measure of an angle when given two angles that are complementary?

Back

Subtract the measure of one angle from 90 degrees.

Front

How do you find the measure of an angle when given two angles that are supplementary?

Back

Subtract the measure of one angle from 180 degrees.

Front

What is the notation used to represent an angle?

Back

Angles are often represented using the symbol '∠' followed by the points that form the angle.

Front

What is the difference between an angle's vertex and its sides?

Back

The vertex of an angle is the point where the two sides meet, and the sides are the rays that form the angle.