Basic Angle Relationships

Front

What are adjacent angles?

Back

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

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 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 two angles are adjacent and one measures 30 degrees, what is the maximum measure of the other angle?

Back

The maximum measure of the other angle can be 150 degrees, making them supplementary.

Front

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

Back

The measure of the complementary angle is 45 degrees (90 - 45 = 45 degrees).

Front

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

Back

The measure of the supplementary angle is 60 degrees (180 - 120 = 60 degrees).

Front

What is the relationship between two angles that are both 90 degrees?

Back

They are complementary angles.

Front

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

Back

The measures of vertical angles are equal.

Front

If angle C is 70 degrees, what is the measure of its complementary angle?

Back

The measure of the complementary angle is 20 degrees (90 - 70 = 20 degrees).