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 are vertical angles?

Back

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

Front

What are linear pairs?

Back

A pair of adjacent angles formed when two lines intersect; they are supplementary.

Front

If angle A is 67°, what is its complementary angle?

Back

23°

Front

If angle B is 120°, what is its supplementary angle?

Back

60°

Front

If two angles are vertical angles and one measures 25°, what is the measure of the other angle?

Back

25°.

Front

If angle C is 39°, what is the measure of its supplementary angle?

Back

141°.

Front

If angle D is 90°, what are the measures of its complementary angles?

Back

0° (or any angle that adds up to 90°).

Front

If two angles form a linear pair and one measures 10°, what is the measure of the other angle?

Back

170°.