The egyptians.their pyramids where formed as triangular prisms.
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The triangular prism is a geometric shape that has been known since ancient times, so it is difficult to attribute its invention to a single individual. However, the concept of a prism with a triangular base can be traced back to ancient Greek mathematicians such as Euclid. Euclid's Elements, written around 300 BC, contains detailed explanations of various geometric shapes, including the triangular prism.
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
A triangular prism
A triangular prism has two triangular faces, a rectangular prism does not have any.
A triangular prism.
you fold into into a triangular prism