Angle Pair Relationships

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

Name a pair of vertical angles in the figure.

Back

∠1 and ∠4 are a pair of vertical angles.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180 degrees.

Front

What are complementary angles?

Back

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

Front

Give an example of a pair of complementary angles.

Back

81° and 9° are complementary angles.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

Give an example of a pair of supplementary angles.

Back

∠2 and ∠4 are supplementary angles.

Front

What are adjacent angles?

Back

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

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on different parallel lines cut by a transversal.

Front

What is the sum of the angles in a triangle?

Back

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