User:Kmhkmh/sandbox2

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De Gua's theorem is a generalization of the Pythagorean theorem to three dimensions and named for Jean Paul de Gua de Malves. If a tetrahedron has a right angle corner (a corner like a cube), then the square of the area of the face opposite the right angle corner is the sum of the squares of the areas of the other three faces.

A_{yellow}^2=A_{green}^2+A_{blue}^2+A_{red}^2

front - face opposite of the right angle corner back - faces at right angle corner view from the side

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