A rectangular solid is 3-dimensional, but I'm assuming you mean a 2-dimensional representation of a rectangular solid, which is called a net. Do a search for the following: "net rectangular prism" and you will see a drawing of it.
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Trapezoid
The formula for the surface area of a rectangular solid is = 2lw + 2lh + 2wh 2(length x width)+2(length x height)+2(width x height)
a rectangular prism yeah
a triangular prism
Perhaps a rectangular prism