Rectangular is an adjective, not a noun. The answer depends on rectangular WHAT!
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A 3-D rectangle
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It is impossible to tell. You need to know a rectangular WHAT? A rectangular prism, a rectangular pyramid, a rectangular dipyramid, etc will all give different answers.
Rectangular is an adjective, not a noun so there is no such thing as a rectangular. You an have a rectangular lamina, a rectangular pyramid, a rectangular prism, a rectangular antiprism and they all have different solid shapes.
Square Pyramid, Cube, Triangular Prism, Sphere, Cylinder, Rectangular Pyramid, Rectangular Prism, Cone.