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Take a look to our Cheat Sheet with some of the major mathematical concepts. You can download them to be by your side when you study.

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Check out our list of formulas, symbols, curves and more! Search our list of frequently asked questions for answers to your questions.

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"Nothing takes place in the world whose meaning is not that of some maximum or minimum."

Leonhard Euler

**Diameter**

A line segment that contains the center and has its endpoints on the circle. Also, the length of this segment.