In geometry, a triangle is always found in a prism.
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rectangle
When the 3-d shape is a prism and the cross section is in a plane at right angles to the length of the prism.
The solid figure swept out by a polygon which moves in a constant direction not in the plane of the polygon. If the direction is perpendicular to the plane then it is a right prism.See related link for another definition.
Rectangle prism
Cut the prism by a plane that is angled so that three of the prism's vertices are on one side of the plane and three on the other. The resulting cross-section will be a hexagon.