How to find the length of an edge of a tetrahedron - ISEE Upper Level Quantitative Reasoning

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Question

A triangular pyramid, or tetrahedron, with volume 100 has four vertices with Cartesian coordinates

where .

Evaluate .

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Answer

The tetrahedron is as follows (figure not to scale):

Tetrahedron

This is a triangular pyramid with a right triangle with legs 10 and as its base; the area of the base is

The height of the pyramid is 5, so

Set this equal to 100 to get :

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