Decagon

A decagon is a 10-sided polygon.

Decagon is an elementary-school-level concept.

Classroom Articles on Polygons

	Dodecagon	Pentagon
	Equilateral Triangle	Polygon
	Hendecagon	Quadrilateral
	Heptagon	Rectangle
	Hexagon	Regular Polygon
	Isosceles Triangle	Right Triangle
	Nonagon	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