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Here is the problem: Find the area of a regular pentagon with side 4.

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Compute the area from the shape prime s dimensions, all in the same length unit; the area is in that unit squared.

3
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Apothem (centre to the middle of a side).

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Half the perimeter times the apothem.

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So the answer is Area equals 27.52763841 square units; perimeter equals 20 units.

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Area measures how many unit squares fit inside a flat shape, so it is always in squared units such as cm squared or m squared.

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The area 27.52763841 is positive and in square units.