Angle Relationships

Front

What are adjacent angles?

Back

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

Front

What is the measure of complementary angles?

Back

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

Front

What is the measure of supplementary angles?

Back

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

Front

What type of angle measures less than 90 degrees?

Back

An acute angle measures less than 90 degrees.

Front

What type of angle measures exactly 90 degrees?

Back

A right angle measures exactly 90 degrees.

Front

What type of angle measures more than 90 degrees but less than 180 degrees?

Back

An obtuse angle measures more than 90 degrees but less than 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

If m∠1 = 30°, what is m∠3 if ∠1 and ∠3 are adjacent?

Back

m∠3 = 30° (if they are the same angle).

Front

If two angles are supplementary and one angle measures 70°, what is the measure of the other angle?

Back

The other angle measures 110° (180° - 70° = 110°).

Front

If two angles are complementary and one angle measures 40°, what is the measure of the other angle?

Back

The other angle measures 50° (90° - 40° = 50°).