Despite your best efforts, you will probably not be able to remember every single fact about every single possible algebra or geometry property in the universe for the GRE. The good news – it doesn’t matter!

Beyond the simplest properties, most relevant information can be derived from what you know. When solving the following problem, see if you can do it *without* knowing the formula for a trapezoid.

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Even if you don’t have the formula for the area of a trapezoid memorized, you can still solve this problem, because a trapezoid is made up of a rectangle and two triangles (the formulae of which you DO definitely need to know). So if you come across a fact or figure on a test that you can’t calculate, don’t freak out – see if you can use *what you already know* to solve the problem!