GRE Math Review 3 GEOMETRY

Geometry Figure 3 below shows two lines, l sub 1 and l sub 2, that are perpendicular, denoted by l sub 1, followed by the perpendicular symbol, followed by l sub 2. Geometry Figure 3 A common way to indicate that an angle is a right angle is to draw a small square at the vertex of the angle, as shown in Geometry Figure 4 below, where P O N is a ... ................
................