Nonagon

A nonagon is a 9-sided polygon.

Nonagon is an elementary-school-level concept.

Classroom Articles on Polygons

	Decagon	Pentagon
	Dodecagon	Polygon
	Equilateral Triangle	Quadrilateral
	Hendecagon	Rectangle
	Heptagon	Regular Polygon
	Hexagon	Right Triangle
	Isosceles Triangle	Square
	Octagon	Trapezoid
	Parallelogram	Triangle

Classroom Articles on Geometry (Up to Elementary-School Level)

	Acute Angle	Parallel
	Angle	Perimeter
	Area	Perpendicular
	Circle	Point
	Cone	Prism
	Cube	Pyramid
	Cylinder	Radius
	Diameter	Sphere
	Geometric Construction	Surface Area
	Obtuse Angle	Volume