Angle Pairs and Perpendicular Lines

Two angles are __________ if the sum of their measures is 180.

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

What is the measure of the supplement of a 40° angle? (You do not need to type degree symbol.)

What is the measure of the complement of a 40° angle? (You do not need to type degree symbol.)

Two angles are an adjacent pair if they (select all that apply):

• are supplementary or complementary

• have the same vertex

• share a common side

• have no interior points in common

True or false: If the exterior sides of a pair of adjacent angles form a straight line, then the angles are supplementary.

• True

• False

Pairs of nonadjacent (opposite) angles formed by two intersecting lines are called ________ angles.

True or false: If two angles are complementary (or supplementary) to the same angle or to congruent angles, then they are congruent.

• True

• False

Vertical angles are:

• acute

• transitive

• congruent

• adjacent

If two angles are congruent and supplementary, then each is a ______ angle.