Angle Relationships

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a vertical angle?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

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

Back

60 degrees.

Front

If two angles are supplementary and one measures 110 degrees, what is the other angle?

Back

70 degrees.

Front

What is the measure of each angle in a right triangle?

Back

One angle is 90 degrees, and the other two angles add up to 90 degrees.

Front

Find the value of x if x + 50 = 90.

Back

x = 40.

Front

Find the value of x if 2x + 30 = 180.

Back

x = 75.