Pyramid

A pyramid is a polyhedron with one face (known as the "base") a polygon and all the other faces' triangles meeting at a common polygon vertex (known as the "apex").

Pyramid is an elementary-school-level concept. It is listed in the California State Standards for Grade 2.

Examples

Tetrahedron:

(1) A general tetrahedron is any polyhedron having four faces. (2) The regular tetrahedron is the Platonic solid comprised of four equilateral triangles, four vertices, and six edges.

Classroom Articles on Solid Geometry

	Cone	Platonic Solid
	Convex Hull	Polyhedron
	Cross Section	Prism
	Cube	Solid Geometry
	Cylinder	Sphere
	Dodecahedron	Surface
	Icosahedron	Surface Area
	Octahedron	Volume

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

	Acute Angle	Octagon
	Angle	Parallel
	Area	Parallelogram
	Circle	Pentagon
	Decagon	Perimeter
	Diameter	Perpendicular
	Dodecagon	Point
	Equilateral Triangle	Polygon
	Geometric Construction	Quadrilateral
	Hendecagon	Radius
	Heptagon	Rectangle
	Hexagon	Regular Polygon
	Isosceles Triangle	Right Triangle
	Nonagon	Square
	Obtuse Angle	Triangle