Calculating the area of a pentagon in Ptyhon3, **“a”** and **“r”** **length** must be known. You see a triangle in the bottom picture. After calculating the area of the triangle, the area of the pentagon can be found by multiplying with 5.

Python3 Code:

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# coding: utf-8 a = input("input the border length? ") r = input("input radius (r): ") area = (5 * (int (a) * int (r) )) / 2 perimeter = 5 * int(a) print ("Pentagon area :"+ str(area)) print ("Pentagon perimeter :"+ str(perimeter)) |

**Output:**

**Online Editor:**