Complementary and Supplementary Angles

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 equal.

Front

What are adjacent angles?

Back

Two angles that share a common side and a common vertex.

Front

If angle A is 30 degrees, what is the measure of its complementary angle?

Back

60 degrees (90 - 30 = 60).

Front

If angle B is 120 degrees, what is the measure of its supplementary angle?

Back

60 degrees (180 - 120 = 60).

Front

What is the equation to find the value of x if two angles are complementary?

Back

x + y = 90, where x and y are the measures of the angles.

Front

What is the equation to find the value of x if two angles are supplementary?

Back

x + y = 180, where x and y are the measures of the angles.

Front

If two angles are vertical angles, what can we say about their measures?

Back

They are equal.

Front

If angle C is 45 degrees, what is the measure of its complementary angle?

Back

45 degrees (90 - 45 = 45).