Straight triangular prism is a sub-concept, which can be started from the original concept-prism.
Prism: Generally speaking, a polyhedron has two parallel faces, the other face is a quadrilateral, and the intersection lines of two adjacent sides are parallel to each other. This polyhedron is called a prism.
In addition, a straight prism: a prism with perpendicular sides and bottoms is called a straight prism.
Finally, there is a regular triangular prism: all three sides are parallel, and the upper and lower sides are parallel and congruent regular triangles. A regular prism is a prism whose side is perpendicular to the bottom surface and whose bottom surface is a regular polygon.
Special attention: the bottom surface is a regular polygon, and the sides are perpendicular to the bottom surface, but the lengths of the sides and the bottom surface are not necessarily equal.
Therefore, the 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.
Regular triangular prism: three sides are perpendicular to the upper and lower bottom surfaces, and the upper and lower bottom surfaces are regular triangles with rectangular sides. \x0d regular triangular prism: three sides are perpendicular to the upper and lower bottom surfaces, and the sides are rectangular. \x0d Regular triangular prism is the same as regular triangular prism.