GRE Geometry Essentials

Geometry questions use basic formulas.

Key Points

1. Area of a triangle = half base times height
2. Area of a circle = pi times radius squared
3. Circumference = 2 times pi times radius
4. Pythagorean theorem: a squared plus b squared equals c squared
5. Angles in a triangle add to 180 degrees

Expert Tip

Figures are not always drawn to scale.