Classifying Angles and Angle 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

Identify a pair of vertical angles in the following diagram: (provide a diagram with angles labeled 1, 2, 3, 4).

Back

Angles 1 and 4 are a pair of vertical angles.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What are complementary angles?

Back

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

Front

Identify a pair of complementary angles in the following diagram: (provide a diagram with angles labeled 1, 2, 3, 4).

Back

Angles 1 and 2 are a pair of complementary angles.

Front

What is the sum of the angles in a triangle?

Back

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

Front

What are supplementary angles?

Back

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

Front

Identify a pair of supplementary angles in the following diagram: (provide a diagram with angles labeled 1, 2, 3, 4).

Back

Angles 1 and 3 are a pair of supplementary angles.

Front

What is the relationship between adjacent angles?

Back

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