A triangular dipyramid.
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A triangular pyramid is a four sided 3D shape. All four sides are triangles. It resembles a 'traditional' pyramid, like the ones in Egypt. A triangular prism is a five sided 3D shape. It consists of two identical triangular sides connected by three identical rectangular sides. think of it as a cylinder with triangles on the ends and three sides instead of a smooth surface.
It is a tetrahedron, which is defined as a four- sided figure with all triangular sides.
a eight sided shape is called a octagon.
a five sided shape is called a pentagon!
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.