Pythagoras in 3-D: TWO WAYS! (VIDEO!)

In this video we take Pythagoras’s theorem and generalise it to a three-dimensional version in two ways. The first is the classic way as everybody does (which I am obligated to show, I guess) and the second is a snazzy not-well-known approach due to de Gua from the 1700s. Really cool!

Pythagoras in 3-D


    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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