Trirectangular tetrahedron – Wikipedia

A trirectangular tetrahedron can be constructed by a coordinate octant and a plane crossing all 3 axes away from the origin, like:x>0y>0z>0and x/a+y/b+z/c<1In geometry, a trirectangular tetrahedron is a tetrahedron where all three face angles at one vertex are right angles.

Source: Trirectangular tetrahedron – Wikipedia

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