## GMAT Quantitative Review

## 3.0 Math Review

### 3.3 Geometry

### 3. Perpendicular Lines

An angle that has a measure of is a *right angle.* If two lines intersect at right angles, the lines are *perpendicular*. For example:

and above are perpendicular, denoted by . A right angle symbol in an angle of intersection indicates that the lines are perpendicular.