Just as with the algebra and arithmetic sections of the GRE, the geometry questions in the math section test your knowledge of basic, simple geometry that you probably learned in middle school or earlier! Sounds simple, right? Again, it's simple, but deceptively so -- the GRE is infamous for making easy questions look hard.
You'll need to know the basics about:
- Degrees
- Lines
- Angles
- Squares and Rectangles
- Triangles, including Equilateral, Isosceles, Right, Obtuse, Acute, and 30-60-90
- Pythagorean Theorem
- Circles, including radius, diameter, circumference and arcs
- Coordinate System, including y-intercept and slope
- Solid Geometry, including volume, diagonals and total surface area
You've probably heard of these things already, and probably know a trick or two about some of them. Again, you need to know your basics, because the harder geometry questions involve several steps, and in each step you will be required to know what you need to do in order to get closer to the desired answer.