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.
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rectangular
They are in a rectangular shape because it holds more room than any other shape.
a rectangular prisim
There are many such solids: A heptagonal pyramid A cuboid (or rectangular prism) A hexagonal dipyramid A pentagonal pyramid with a 2-vertex shape on the other side etc.
It is roughly rectangular in shape