A triangular prism can have right angles. If the prism has two triangular ends, then each of the three 'sides' meets each of the ends at right angles.
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simply judging from the great pyramids at Egypt versus any other man-made structure in history, i'd say that the triangular prism is the sturdiest
The faces are always rectangles on prisms, so if it's a triangular prism the bases are triangles; if it's a rectangular prism, the bases are rectangles; if it's a hexagonal prism, the bases are hexagons. Any polygon can form the base of a prism. Some people also consider cylinders to be circular prisms. In which case any closed plane shape can form the base of a prism.
A rhombus normally has no right angles (at the vertices). If a rhombus has right angles (at the vertices), it is called a square. The diagonals of a rhombus meet at right angles.
It depends what kind of prism: Rectangular prism-rectangle Could be circle too. It depends on what kind of prism it is. If it is a rectangular prism, it's base is a rectangle. If it's a triangular prism, it's base will be a triangle. P.S.-If you have any other questions about prisms or geometry in general, feel free to ask me!
Any polygon with at least 7 sides CAN have 5 right angles.