That depends on the size of the pentagon, and whether it is regular or not. In general, you can divide the pentagon into three triangles, and calculate the area of each triangle separately.
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180° (n - 2), where n is the number of sides.
A = 2480cm
A = s2 * 1.72
Any 5 sided polygon is a pentagon. There is no formula for it. We have formulas for area and perimeter. Perhaps that is what you are asking?
Area of pentagon * length of prism.