Furthermore, the angles opposite each other have to be equal.

If two lines intersect, the sum of the resulting four angles equals 360°. That is something we must be told, in one form or another.

By contrast, we cannot assume perpendicularity: if we didn’t have that special little blue square guaranteeing that the lines were perpendicular, we could not assume that either angle ADB or angle BCD were right angles. If it looks like there’s no bend in the line, then there’s no bend: i.e. Notice, also, that “straightness” is one of the very few things we can assume on the GRE. Line ADC is “straight” but not “horizontal.” By contrast, a “horizontal” line is parallel to the top or bottom of the page, parallel to the distant horizon. Any line that doesn’t bend or curve is “straight,” regardless of direction. BTW, make sure you don’t confuse “straight” lines with “horizontal” lines. A straight line is made up of 180 degrees.Ĭlick here to learn more about angles and lines The shaded area is what fraction of the largest circle?Ĭheck your answer and view the video explanation here!Ī right angle is made up of 90 degrees. Each of the diameters of the small circles with centers B and F equals the radius of the medium-sized circle with center D. In the diagram, point D is the center of the medium-sized circle that passes through C and E, and it is also the center of the largest circle that passes through A and G. So that you can see the difference, we’ve pulled two problems from the Magoosh GRE prep course so you can try your hand at them. Those are it in a nutshell-the GRE geometry formulas you’ll need on test day! However, memorizing formulas and putting them into practice are two very different things. Sample GRE Geometry Formula Practice Questions Click here for a printable cheat sheet of GRE math formulas!.If two lines intersect, the sum of the resulting four angles equals 360.A straight line is made up of 180 degrees.A right angle is made up of 90 degrees.Bookmark this page, and read on for more in-depth explanations of each geometry formula. Need to see the key geometry formulas in one place? You’re in luck! Here’s a list of geometry formulas you’ll need on test day.

If you’re interested in more than geometry, try our more general GRE Math Formula eBook!

Sample GRE Geometry Formula Practice Questions.

This list is by no means exhaustive, but for must-know concepts you’ve come to the right place. Below are the GRE geometry rules and geometry formulas you have to know. That doesn’t mean that the GRE is void of geometry. Well, if you are taking the GRE, you were by no means mistaken-proofs and indeed all of trig are nowhere to be found on GRE math. Perhaps you recall with more than a little dread your high school geometry class: fifteen-step proofs and the law of cosines were two things you were certain you’d never see again.

Isosceles right triangle volume formula