Angle Proofs

Front

What is a linear pair of angles?

Back

A linear pair of angles consists of two adjacent angles whose non-common sides form a straight line. The sum of the angles in a linear pair is always 180 degrees.

Front

What is the definition of supplementary angles?

Back

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

Front

What does the Angle Addition Postulate state?

Back

The Angle Addition Postulate states that if point B is in the interior of angle AOC, then m∠AOB + m∠BOC = m∠AOC.

Front

What is the definition of a right angle?

Back

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

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are two lines that intersect to form a right angle.

Front

What is the Substitution Property in geometry?

Back

The Substitution Property states that if two quantities are equal, one can be substituted for the other in any expression.

Front

What is the Linear Pair Postulate?

Back

The Linear Pair Postulate states that if two angles form a linear pair, then they are supplementary.

Front

What is the relationship between complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the definition of adjacent angles?

Back

Adjacent angles are two angles that share a common vertex and a common side but do not overlap.

Front

What is the definition of vertical angles?

Back

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