Types of Angles

Front

Adjacent Angles

Back

Two angles that share a common side and vertex.

Front

Vertical Angles

Back

Two angles directly across from each other on intersecting lines. Always congruent.

Front

Complementary Angles

Back

Two angles with measures that have a sum of 90°. Do not have to be adjacent.

Front

Supplementary Angles

Back

Two angles with measures that have a sum of 180°. Do not have to be adjacent.

Front

Linear Pair

Back

Adjacent angles that are supplementary. Combined, they form a straight line.

Front

Perpendicular Lines

Back

Two lines that intersect at a 90° angle (right angle). Symbol: ⊥

Front

Angle Bisector

Back

A line or ray that divides an angle into two equal parts.