Enneadecagon facts for kids

A enneadecagon or 19-gon is a shape that has 19 straight sides and 19 corners. It's also sometimes called an enneakaidecagon or a nonadecagon. Think of it as a polygon with a lot of sides!

Quick facts for kids Regular enneadecagon
A regular enneadecagon
Type	Regular polygon
Edges and vertices	19
Schläfli symbol	{19}
Coxeter diagram
Symmetry group	Dihedral (D19), order 2×19
Internal angle (degrees)	≈161.052°
Dual polygon	Self
Properties	Convex, cyclic, equilateral, isogonal, isotoxal

What is a Regular Enneadecagon?

A regular enneadecagon is a special type of enneadecagon where all 19 sides are exactly the same length. Also, all 19 corners (or angles) inside the shape are equal.

Each corner of a regular enneadecagon measures about 161.052 degrees. If you add up all the angles inside a regular enneadecagon, they will total 6840 degrees.

Like other regular polygons, an enneadecagon can fit perfectly inside a circle. This circle is called its circumcircle.

Images for kids

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  This animation shows how you can roughly draw an enneadecagon.

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  This image shows the different ways a regular enneadecagon can be symmetrical.

See also

In Spanish: Eneadecágono para niños