Pentagon Calculator
A regular pentagon is a polygon with 5 vertices. This form is often used in construction and architecture. Enter one of the known values, then click calculate.
.Pentagon Calculator
Side length (a)
Diagonal (D)
Height (h)
Периметр(p)
Square (S)
The radius of the circumscribed circle (R)
Radius of the inscribed circle (r)
Formulas:
d = a / 2 * ( 1 + √5 )
h = a / 2 * √ 5 + 2 * √5
Р = 5 * а
S = a2 / 4 * √ 25 + 10 * √5
R = a / 10 * √ 50 + 10 * √5
r = a / 10 * √ 25 + 10 * √5
Angle: 72°, 5 sides.
