Regular Pentagon Calculator


Regular Pentagon - a shape defined by having 5 sides and internal angles amounting to 540 degrees. The name comes from Greek πέντε (pente) meaning five and and γωνία (gonia) meaning a corner, an angle.

Equation form:

Perimeter = 5 * a
Area enclosed (A) =a² * √(25 + 10 * √5)
Area(AC) of circumscribed circle about pentagon with side a:
AC =2 * π * a²
5 - √5

About Regular Pentagon Calculator tool.

Remember this tool should be used only to calculate area, perimeter or volume of a figure. The results we provide are accurate, but rounded to the 12th decimal place. It accepts scientific notation and converts immediately.