it is a rectangular pyramid thing so it would have the rectangle as a base and the triangles on each side of the rectangle conected together
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It is a three dimensional figure of some sort.
A regular tetrahedron
triangular prism
Pyramid
A cube is a three dimensional object with all sides of equal length. A rectangle is a two dimensional figure with two pairs of sides equal in length. Three dimensional is like a rubrics cube, something you can hold. A two dimensional figure is something you can not hold, a drawing is two dimensional.