Q1, HW #18 - Definitions, Postulates and Theorems

Front

What theorem states that vertical angles are congruent?

Back

The Vertical Angle Theorem.

Front

What is a statement of the meaning of a word or word group?

Back

Definition.

Front

What is a true statement that must be proven?

Back

Theorem.

Front

What do you call adjacent angles that are supplementary and form a straight line?

Back

Linear Pair.

Front

What justifies the statement: If m∠ABC=90°, then ∠ABC is a right angle?

Back

Definition of a Right Angle.

Front

What is a statement accepted without proof in geometry?

Back

Postulate.

Front

What is the relationship between complementary angles?

Back

Two angles that add up to 90°.

Front

What is the definition of supplementary angles?

Back

Two angles that add up to 180°.

Front

What is a corollary?

Back

A statement that follows readily from a previous statement.

Front

What is the difference between a theorem and a postulate?

Back

A theorem must be proven; a postulate is accepted without proof.