Angle Relationships

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 is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is a straight angle?

Back

A straight angle measures 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

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex but do not overlap.

Front

If one angle measures 30 degrees, what is its complementary angle?

Back

The complementary angle measures 60 degrees (90 - 30 = 60).

Front

If one angle measures 150 degrees, what is its supplementary angle?

Back

The supplementary angle measures 30 degrees (180 - 150 = 30).

Front

What is the sum of the angles in a triangle?

Back

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