Assertion: orthogonal tetrahedron | /r/HasAspect | many interesting properties
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text: Orthocentric and orthogonal tetrahedrons have many interesting properties - I'll mention only the following: being a 3D analog of the right triangle, the orthogonal tetrahedron satisfies the 3D analog of the Pythagorean Theorem (Faulhaber's Theorem, De Gua's Theorem - last link below): the squared area of the 'face-hypotenuse' is equal to the sum of the squared areas of other 3 faces.