12.5 Warm-Up

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

Identify the type of angle that measures 90 degrees.

Back

A right angle.

Front

Identify the type of angle that measures more than 90 degrees but less than 180 degrees.

Back

An obtuse angle.

Front

Identify the type of angle that measures less than 90 degrees.

Back

An acute angle.

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

If one angle measures 40 degrees, what is the measure of its complement?

Back

The complement of a 40-degree angle is 50 degrees.

Front

If one angle measures 130 degrees, what is the measure of its supplement?

Back

The supplement of a 130-degree angle is 50 degrees.

Front

What is a straight angle?

Back

A straight angle measures exactly 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 is the relationship between complementary angles?

Back

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