A **literal equation** is one in which some or all of the constants are represented by **letters**. Arguably any mathematical formula expressing an actual relationship between its variables is a literal equation. Take the **Pythagorean theorem** formula as an example.

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It consists of three variables, a and b are the side lengths while c represents the length of the **hypotenuse**. It can manipulated in a couple of ways:

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When a formula contains numbers as well, such as the area of a circle, A = Ï€rÂ², it’s called a** numerical equation** â€“ Ï€ is an irrational number. Therefore, given that literal equations don’t have numbers, rearranging them should never yield any numbers. Let’s try rearranging a few equations in the following video: