There are different formulae for different shapes and these vary in complexity.
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You need to find the area of each two dimensional surface on the figure. Do you have a specific figure in mind?
Break it down into smaller shapes, find the area of those bits, then add them all together.
The rule for S.A = 2bh + 2bw + 2hw
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find the area of triangles(reflecting surfaces) and also the area of rectangle or square(base)and find the sum of both.