The calculator of the nine-sided
Calculation of a nine-polygon (a figure with nine vertices). Enter one known value, then click calculate.
.The calculator of the nine-polygon, enter one known value
Side length (a)
Smaller diagonal (d1)
The middle diagonal (e)
Large diagonal (d3)
Height (h)
Perimeter (p)
Square (S)
The radius of the circumscribed circle (R)
Radius of the inscribed circle (r)
Formulas:
a = 2 * R * sin( π / 9 )
d = 2 * R * sin( 2 * π / 9 )
e = 2 * R * sin( 3 * π / 9 )
f = 2 * R * sin( 4 * π / 9 )
h = R + r
p = 9 * a
S = 9/2 * R * sin( 2 * π / 9 )
r = a / 2 * tan( π / 9 )
Angle: 140°, 27 diagonals.