Trapezoid

A trapezoid is a quadrilateral with two sides parallel.

Trapezoid is a middle school-level concept. It is listed in the California State Standards for Grade 7.

Classroom Articles on Polygons

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

Classroom Articles on Geometry (Up to Middle School Level)

	Acute Angle	Midpoint
	Altitude	Obtuse Angle
	Angle	Octahedron
	Area	Parallel
	Circle	Perimeter
	Circumference	Perpendicular
	Complementary Angles	Pi
	Cone	Point
	Congruent	Prism
	Cube	Pyramid
	Cylinder	Radius
	Diameter	Sphere
	Dodecahedron	Supplementary Angles
	Geometric Construction	Surface
	Golden Ratio	Surface Area
	Golden Rectangle	Tetrahedron
	Hypotenuse	Volume
	Icosahedron