Angle Proofs

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 Complementary Angles?

Back

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

Front

What does the Angle Addition Postulate state?

Back

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

Front

What is the Substitution Property?

Back

If two quantities are equal, one can be substituted for the other in any expression.

Front

What is a Linear Pair?

Back

A linear pair is a pair of adjacent angles formed when two lines intersect. The angles are supplementary.

Front

What are Perpendicular Lines?

Back

Two lines that intersect to form a right angle (90 degrees).

Front

What are Parallel Lines?

Back

Two lines that never intersect and are always the same distance apart.

Front

What is the Definition of a Right Angle?

Back

An angle that measures exactly 90 degrees.

Front

What is the relationship between intersecting lines and angles?

Back

When two lines intersect, they form two pairs of vertical angles that are equal.

Front

How do you identify a right angle in a proof?

Back

A right angle can be identified by the presence of a square symbol in the angle.