Angle Relationships

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What is the sum of angles in a triangle?

Back

180°.

Front

What is the definition of vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

What is the definition of adjacent angles?

Back

Angles that share a common side and a common vertex.

Front

If two angles are complementary, what is the relationship between them?

Back

Their measures add up to 90°.

Front

If two angles are supplementary, what is the relationship between them?

Back

Their measures add up to 180°.

Front

What is the measure of each angle in a right triangle?

Back

One angle is 90°, and the other two angles are acute, adding up to 90°.

Front

How do you find the measure of an unknown angle in a linear pair?

Back

Subtract the known angle from 180°.

Front

What is the relationship between the angles in a straight line?

Back

The angles on a straight line add up to 180°.