A polygon with 7 vertices is called a heptagon, this calculator calculates the correct heptagon. This form is quite rare. Enter one known value, then click calculate.
Heptagon calculator, enter one known value
Side length (a)
Large diagonal (d1)
Smaller diagonal (d2)
The radius of the circumscribed circle (R)
Radius of the inscribed circle (r)
d = a / ( 2 * sin ( π/2 / 7 ) )
e = 2 * a * cos ( π / 7 )
h = a / ( 2 * tan ( π/2 / 7 ) )
p = 7 * a
S = 7/4 * a² / tan ( π / 7 )
R = a / ( 2 * sin ( π / 7 ) )
r = a / ( 2 * tan ( π / 7 ) )
Angle: 5/7*180° ≈ 128,57°, 14 diagonals.