Angles and Angle Relationships

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 are vertical angles?

Back

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

Front

What is an angle bisector?

Back

An angle bisector is a line or ray that divides an angle into two equal parts.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of a transversal and inside the two lines. They are equal when the lines are parallel.

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in the same position on two parallel lines cut by a transversal. They are equal.

Front

What is the measure of angle 4 if m∠8 = 76°?

Back

m∠4 = 76° because they are corresponding angles.

Front

If angle 1 and angle 6 are alternate interior angles, what can be said about their measures?

Back

Angle 1 and angle 6 are equal in measure.

Front

What is the relationship between angle 3 and angle 6 if they are alternate interior angles?

Back

Angle 3 and angle 6 are equal because they are alternate interior angles.

Front

What is the sum of the measures of complementary angles?

Back

The sum of the measures of complementary angles is 90 degrees.