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Hendecagon facts for kids

Kids Encyclopedia Facts
Regular hendecagon
A hendecagon

A hendecagon or 11-gon is a shape with 11 sides and 11 corners.

Regular hendecagon

All sides of a regular hendecagon are the same length. Each corner is 147.27°. All corners added together equal 1619.97°.

Area

The amount of space a regular hendecagon takes up is

\alpha = \frac{(n - 2)}{n} \cdot 180^\circ = \frac{9}{11} \cdot 180^\circ \approx 147{,}273^\circ
A = \frac{11}{4}a^2 \cot \frac{\pi}{11} \approx 9,36564a^2 \,

a is the length of one of its sides.


Images for kids

  • Symmetries of hendecagon

    Symmetries of a regular hendecagon. Vertices are colored by their symmetry positions. Blue mirror lines are drawn through vertices and edge. Gyration orders are given in the center.

See also

Kids robot.svg In Spanish: Endecágono para niños

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Hendecagon Facts for Kids. Kiddle Encyclopedia.