Angles

Front

What is an angle?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures 90 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 does it mean for angles to be congruent?

Back

Congruent angles are angles that have the same measure.

Front

If one angle measures 50 degrees, what is its supplementary angle?

Back

The supplementary angle is 130 degrees, since 180 - 50 = 130.

Front

If two angles are complementary and one measures 30 degrees, what is the other angle?

Back

The other angle measures 60 degrees, since 90 - 30 = 60.

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 an acute angle?

Back

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