Assuming that this is a rectangular prism, you just multiply length times width.
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You will need to find the surface area of each face and add them together.
To find the SA of any prism, find the area of each face. (*Note: Depending on the shape of the face, there might be different formulas. Area of Square=length x length Area of Triangle=base x height divided by 2 Area of Trapezoid=A1+A2 (divide the trapezoid into two triangles and find the area of each triangle, then add them) ) After you find the areas of all the faces of the prism, add all the areas to get the SA.
Find the area of one end of the prism, then multiply it by the length of the prism.
Two of them are equal and the third is not.Calculate the areas of each face and add them together.
you do the area of the base (circle - pi*radius squared) times the height (measure the tubular face).