Properties of Angles and Equality

Front

What is the Corresponding Angles Postulate?

Back

If two parallel lines are cut by a transversal, then each pair of corresponding angles is equal.

Front

What are complementary angles?

Back

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

Front

What is the Transitive Property in geometry?

Back

If angle A is equal to angle B, and angle B is equal to angle C, then angle A is equal to angle C.

Front

What is the definition of congruent angles?

Back

Angles that have the same measure are called congruent angles.

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they never intersect and are always the same distance apart.

Front

What is the Angle Addition Postulate?

Back

If point B is in the interior of angle AOC, then m∠AOB + m∠BOC = m∠AOC.

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 the definition of supplementary angles?

Back

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

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

How do you find the measure of an angle if it is complementary to a 30° angle?

Back

The measure of the angle is 90° - 30° = 60°.