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Octadecagon facts for kids

Kids Encyclopedia Facts
Regular octadecagon
A octadecagon

A octadecagon or 18-gon is a shape with 18 sides and 18 corners.

Regular octadecagon

All sides of a regular octadecagon are the same length. Each corner is 160°. All corners added together equal 2880°.

Area

The amount of space a regular octadecagon takes up is

The area of a regular octadecagon of side length a is given by

A = \frac{18}{4}a^2\cot\frac{\pi}{18}\simeq 25,5208a^2


Images for kids

  • 01-Achtzehneck-Tomahawk

    Octadecagon, an exact construction based on the angle trisection 120° by means of the tomahawk, animation 1 min 34 s.

  • Symmetries of octadecagon

    Symmetries of a regular octadecagon. Vertices are colored by their symmetry positions. Blue mirrors are drawn through vertices, and purple mirrors are drawn through edge. Gyration orders are given in the center.

See also

Kids robot.svg In Spanish: Octodecágono para niños

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Octadecagon Facts for Kids. Kiddle Encyclopedia.