Skip to main content\(\newcommand{\R}{\mathbb{R}}
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The tetrahedron in three-dimensional space. Three sides of the tetrahedron are triangular regions in the coordinate planes, and the fourth side is the triangle with vertices
\((6,0,0)\text{,}\) \((0,3,0)\text{,}\) and
\((0,0,2)\text{.}\)