# Angle Relationships

### By: Marlena Auch and Haley Dougherty

## Complementary, Supplementary, and Adjacent Angles

**Complementary Angle**- two angles whose degrees equal 90° when added together

**Supplementary Angle**- two angles whose degrees equal 180° when added together

**Adjacent Angle**- angles that share one common side

## Right, Acute, Obtuse, and Straight Angles

Right Angle- an internal angle which is equal to 90°

Acute Angle- an angle smaller than 90°

Obtuse Angle- an angle greater than 90°

Straight Angle- angle is exactly 180°

## Linear Pair and Vertical Angles

Linear Pair- a pair of adjacent angles with non-common sides that are opposite rays

Vertical Angles- are two non-adjacent angles formed by two congruent intersecting lines

## Are supplementary angles and a linear pair always the same?

Yes, they are always the same. The supplementary angle and linear pair equal 180° and they both share common sides.