Five lines of equal length are connected from end to end to form a closed shape with equal internal angles, which is called a regular pentagon. Each angle of a regular pentagon is 108° and the length of each side is equal. A regular pentagon is a rotationally symmetric figure, but not a centrosymmetric figure. The area formula of the positive Pentagon is S-shape ==1/4a²*√﹙25+10√5﹚.
Input value: 8
Select value type: circumcircle radius (R)
Click "calculate" to output the result
Area of regular pentagon: 152.1728
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