Types of Angles

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

How do you identify a right angle in a diagram?

Back

A right angle is often indicated by a small square at the vertex of the angle.

Front

What is the sum of angles in a triangle?

Back

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

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

How can you determine if two angles are complementary?

Back

If the sum of the measures of two angles is 90 degrees, they are complementary.

Front

How can you determine if two angles are supplementary?

Back

If the sum of the measures of two angles is 180 degrees, they are supplementary.

Front

What is the relationship between acute angles and right angles?

Back

Acute angles are always less than right angles, which measure 90 degrees.