Writing Proofs

Front

What are complementary angles?

Back

Two angles whose measures add up to 90°.

Front

What does the Reflexive Property of Equality state?

Back

For any quantity a, a = a.

Front

What is the definition of a right angle?

Back

An angle that measures exactly 90°.

Front

What is a midpoint?

Back

A point that divides a segment into two equal parts.

Front

What is the Substitution Property?

Back

If a = b, then a can be replaced by b in any expression.

Front

What are supplementary angles?

Back

Two angles whose measures add up to 180°.

Front

What does the Transitive Property of Equality state?

Back

If a = b and b = c, then a = c.

Front

What is the Angle Addition Postulate?

Back

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

Front

What is the Segment Addition Postulate?

Back

If B is between A and C, then AB + BC = AC.

Front

What are congruent angles?

Back

Angles that have the same measure.