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

What is the definition of supplementary angles?

Back

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

Front

What is the value of x if angle 1 is 45 degrees and angle 2 is supplementary to angle 1?

Back

X = 135 degrees.

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 is the sum of the angles in a triangle?

Back

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

Front

If angle A is 51 degrees, what is the complementary angle?

Back

The complementary angle is 39 degrees.

Front

What are corresponding angles?

Back

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

Front

What is the relationship between angles formed by intersecting lines?

Back

The angles formed by intersecting lines include vertical angles (equal), adjacent angles (sum to 180 degrees), and linear pairs (also sum to 180 degrees).

Front

If two angles are complementary and one angle measures 72 degrees, what is the measure of the other angle?

Back

The other angle measures 18 degrees.

Front

What is the measure of the supplementary angle to 108 degrees?

Back

The supplementary angle measures 72 degrees.