To find the area of a prism, you have to first find the area of the base and multiply it by 2 (because there are 2 bases). Then, find the perimeter of the base and multiply it by the height of the prism. Lastly, add the area of the bases and the perimeter x height value to get the area of the prism.
** if the prism is a cylinder, do the same thing, finding the area of the circles (bases) and multiplying the height x circumference.
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It is important to remember the formulas when learn Geometry. The surface area formula for a triangular prism is A=2A(subscript B)+(a+b+c)h.