Angles

Front

What is the definition of an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

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 vertical angle?

Back

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

Front

If angle A is 70 degrees, what is the measure of its complement?

Back

The complement of angle A is 20 degrees (90 - 70 = 20).

Front

If angle B is 110 degrees, what is the measure of its supplement?

Back

The supplement of angle B is 70 degrees (180 - 110 = 70).

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 is a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

If two parallel lines are cut by a transversal, what can be said about the alternate interior angles?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What is the measure of angle 4 if angle 3 is 95 degrees and they are supplementary?

Back

Angle 4 measures 85 degrees (180 - 95 = 85).