Finding the Center of a Circle (VIDEO!)

Here’s a cute challenge from geometry …

Suppose you are given a circle. Use only a piece of paper and a pencil to locate the exact center of that circle!

In this video I show you how to find the exact center of a flower pot, or of the lid of a jar of jam, or of a quarter. It’s fun and represents a neat way to motivate some standard results from the curriculum.

Finding the Center


    QUADRATICS, Permutations and Combinations, EXPLODING DOTS, and more!

    Written for educators - and their students too! - this website, slowly growing, takes all the content Tanton has developed in his books, videos, and workshops, and organizes it into short, self-contained, and complete, curriculum units proving that mathematics, at all points of the school curriculum, can be joyous, fresh, innovative, rich, deep-thinking, and devoid of any rote doing! Let's teach generations of students to be self-reliant thinkers, willing to flail and to use their common sense to "nut their way" through challenges, to assess and judge results, and to adjust actions to find success. (Great life skills!)


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