Angle Relationship (Missing Angles)

Front

What is the definition of complementary angles?

Back

Two angles are complementary if the sum of their measures is 90 degrees.

Front

What is the definition of supplementary angles?

Back

Two angles are supplementary if the sum of their measures is 180 degrees.

Front

If two angles are vertical angles, what can be said about their measures?

Back

Vertical angles are equal in measure.

Front

What is the relationship between angles formed by parallel lines and a transversal?

Back

Corresponding angles are equal, alternate interior angles are equal, and consecutive interior angles are supplementary.

Front

If m∠A = 40°, what is m∠B if ∠A and ∠B are supplementary?

Back

m∠B = 140°.

Front

If m∠C = 70°, what is m∠D if ∠C and ∠D are complementary?

Back

m∠D = 20°.

Front

What is the formula to find the missing angle in a triangle?

Back

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

Front

If m∠1 = 50° and m∠2 = 60°, what is m∠3 in a triangle?

Back

m∠3 = 70°.

Front

What is the definition of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

If angle 5 is 55°, what is the measure of its vertical angle?

Back

The vertical angle is also 55°.