The question as posed does not make sense, so I will answer the few variations of the question that would make sense. The reason your question does not make sense is that circumference is a word that refers to a two-dimensional concept whereas a solid is three dimensional. Also circumference refers to a round object whereas a rectangle is not round.
pi = roughly 3.1415926535897...
r = radius of a circle
l = length
h = height
w = width
1) How do I determine the circumference of the circular base of a cylinder?
pi*r squared.
2) What is the surface area of a rectangular solid?
2*l*w + 2*w*h + 2*l*h
3) What is the surface area of the curvacious part of a cylinder?
2*pi*r*h
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If a rectangular solid is a cuboid, the answer is 12.
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.
A rectangular prism.A rectangular prism.A rectangular prism.A rectangular prism.
a rectangular based pyramid
A rectangular prism or cuboid.