Types of Angles

Front

What are complementary angles?

Back

Two angles that add up to 90°.

Front

What are supplementary angles?

Back

Two angles that add up to 180°.

Front

What are vertical angles?

Back

Angles that are opposite of each other when lines intersect.

Front

What are adjacent angles?

Back

Angles that share a common side and vertex.

Front

What is an acute angle?

Back

An angle that measures less than 90°.

Front

What is a right angle?

Back

An angle that measures exactly 90°.

Front

What is an obtuse angle?

Back

An angle that measures more than 90° but less than 180°.

Front

What is a straight angle?

Back

An angle that measures exactly 180°.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is the relationship between complementary angles?

Back

If one angle is known, the other can be found by subtracting from 90°.