Vertical, Adjacent, Complementary and Supplementary Angles

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal in measure.

Front

Define adjacent angles.

Back

Adjacent angles are two angles that share a common side and a common vertex 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

If ∠A and ∠B are supplementary and ∠A = 70°, what is ∠B?

Back

∠B = 110° (because 180° - 70° = 110°).

Front

If ∠C and ∠D are complementary and ∠C = 40°, what is ∠D?

Back

∠D = 50° (because 90° - 40° = 50°).

Front

Name an angle that is adjacent to angle 3 in a figure.

Back

An angle that shares a side with angle 3 and has the same vertex.

Front

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

Back

Their measures are equal.

Front

What is the relationship between two angles that are complementary?

Back

The sum of their measures is 90 degrees.

Front

What is the relationship between two angles that are supplementary?

Back

The sum of their measures is 180 degrees.