Skip to main content\(\newcommand{\R}{\mathbb{R}}
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\)
Coordinate axes for
\(xyz\)-space showing a solid region with vertices
\((0,0,0)\text{,}\) \((1,0,0)\text{,}\) \((0,1,0)\text{,}\) and
\((0,0,1)\text{.}\) Each face of the solid is a triangle. There is also a triangular cross section highlighted. This cross section is parallel to the
\(yz\)-plane. It is marked
\(x=a\text{.}\)