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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

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Octadecagon Facts for Kids. Kiddle Encyclopedia.