If it is an oblique triangular prism, then make any vertical line segment between the planes where the two bottoms are located, which is the height.
(As shown in the figure, the prism ABC-A'B'C' is a straight prism, and the prism DEF-D'E'F' is an oblique prism. )
Because the triangular prism can also be regarded as a trihedron with two vertices cut off, it is also called a truncated trihedron. In addition, because the regular triangular prism is symmetrical and consists of two regular polygons, some people call it a semi-regular pentahedron.
Extended data:
Prism has the following characteristics:
1, all sides are equal, and the sides are parallelogram;
2. The sections parallel to the two bottom surfaces are congruent polygons;
3. The section passing through two non-adjacent sides is a parallelogram;
4. Under the condition of a certain cross-sectional area and length, the longitudinal supporting force of a triangular prism-shaped object is the largest, and the transverse bearing capacity is the smallest (the transverse stress makes the object produce tensile stress, while the longitudinal compressive stress has a reinforcing effect on the object in theory, but the tensile stress is the opposite);
5. Prism volume = bottom area × height.
Straight triangular prism is a very special prism, and its mathematical properties have been better studied because of its particularity. Just as a square is the most special quadrilateral. The picture on the right is very intuitive, and it is the most common straight triangular prism in high school mathematics textbooks.
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