Topic 1 Review

Front

What is the supplement of an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees. The supplement of an acute angle is always obtuse, meaning it measures more than 90 degrees but less than 180 degrees.

Front

Define complementary angles.

Back

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

Front

What does it mean if ray BD bisects ∠ABC?

Back

If ray BD bisects ∠ABC, it means that ∠ABD is congruent to ∠DBC, or in other words, the two angles are equal.

Front

What is the Subtraction Property of Equality?

Back

The Subtraction Property of Equality states that if you subtract the same number from both sides of an equation, the two sides remain equal.

Front

Back

A straight angle measures 180 degrees.

Front

What is the definition of vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent.

Front

What is the Angle Addition Postulate?

Back

The Angle Addition Postulate states that if point D is in the interior of ∠ABC, then the measure of ∠ABD + the measure of ∠DBC = the measure of ∠ABC.

Front

What are supplementary angles?

Back

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

Front

Back

The angle measures 60 degrees.

Front

What is the definition of congruent angles?

Back

Congruent angles are angles that have the same measure.