10.1 "MathXL" - Types of Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

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

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

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

If m∠A + m∠B = 90°, what can we say about angles A and B?

Back

Angles A and B are complementary.

Front

If m∠C + m∠D = 180°, what can we say about angles C and D?

Back

Angles C and D are supplementary.

Front

What is the angle bisector?

Back

An angle bisector is a ray that divides an angle into two equal parts.