Angle Basics Identification

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

What are 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

What is a linear pair of angles?

Back

A linear pair of angles consists of two adjacent angles that form a straight line, adding up to 180 degrees.

Front

Identify the relationship: ∠AOB and ∠COD if they are opposite angles formed by two intersecting lines.

Back

They are vertical angles.

Front

Identify the relationship: ∠AOC and ∠AOD if they share a common vertex and side.

Back

They are adjacent angles.

Front

If ∠1 and ∠2 are complementary, and ∠1 measures 30 degrees, what is the measure of ∠2?

Back

∠2 = 60 degrees.

Front

If ∠3 and ∠4 are supplementary, and ∠3 measures 110 degrees, what is the measure of ∠4?

Back

∠4 = 70 degrees.

Front

What is the sum of the measures of two angles that form a linear pair?

Back

The sum is 180 degrees.