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Hendecagon calculator

Online calculator and formulas for calculating a Hendecagon (eleven-sided polygon)

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Calculate Hendecagon online


This calculater returns various parameters of a Hendecagon (11-gon or eleven-sided polygon).

To perform the calculation, select the required parameter in the menu and enter its value. Then click the 'Calculate' button.

Hendecagon Calculator

 Input
Argument Type
Argument Value
Decimal places
 Results
Side length a
Perimeter P
Area A
Diagonal d2
Diagonal d3
Diagonal d4
Diagonal d5
Height h
Inner radius ri
Outer radius rc
Nonagon

Formulas for a Hendecagon


Perimeter \(P\)

\(\displaystyle P = a · 11 \)


Area \(A\)
\(\displaystyle A = \frac{11 · a^2}{4 · tan(π /11)} \)


Diagonal \(d_2\) (2 corners)
\(\displaystyle d_2= \frac{a · sin(π · 2 / 11)}{sin(2/11)} \)


Diagonal \(d_3\) (3 corners)
\(\displaystyle d_3= \frac{a · sin(π · 3 / 11)}{sin(3/11)} \)


Diagonal \(d_4\) (4 corners)
\(\displaystyle d_4= \frac{a · sin(π · 4 / 11)}{sin(4/11)} \)


Diagonal \(d_5\) (5 corners)
\(\displaystyle d_5= \frac{a · sin(π · 5 / 11)}{sin(5/11)} \)


Height \(h\)
\(\displaystyle h=\frac{ a }{2 · tan(π/2/11)} \)


Inner radius \(ri\)
\(\displaystyle ri=\frac{ a }{2 · tan(π/11)} \)


Outer radius \(ro\)
\(\displaystyle ro=\frac{ a }{2 · sin(π/11)} \)

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