Area and Perimeter of a Pentagon

  • A regular pentagon is a polygon with five edges of equal length.
  • The adjacent edges form an angle of 108°.


Pentagon Area and Perimeter of a Pentagon
  • P – perimeter
  • A – area
  • R – radius K
  • r – radius k
  • O – centre
  • a – edges
  • K – circumscribed circle
  • k – inscribed circle


Enter 1 value

a =
R =
r =

Round to decimal places

Area A =
Perimeter P =

Calculation Procedure


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