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A pyramid is a polyhedron with a polygonal base and a point, called the apex. The number of vertices of a pyramid depends on the regularity of its base: a regular polygon base pyramid has n + 1 vertices, where n is the number of sides of the base.
A tetrahedron, also known as a triangular pyramid, is a polyhedron with four triangular faces, six edges and four vertices. Learn about its regular and irregular forms, measurement, space-filling, subdivision, applications and more.
A pyramid is a structure with triangular sides and a pointy top, often used as a tomb or a monument. Learn about the different civilizations that built pyramids, such as Egypt, Mesopotamia, Sudan and West Africa, and their characteristics and features.
A polyhedron is a three-dimensional figure with flat polygonal faces, straight edges and sharp corners or vertices. Learn about different types of polyhedra, such as convex, star, acoptic, topological and abstract polyhedra, and their properties and classifications.
Learn about the elongated triangular pyramid, a Johnson solid with four triangles and three squares as faces. Find out how to construct, measure and tessellate it with square pyramids and octahedra.
The Louvre Pyramid is a large glass-and-metal structure designed by I. M. Pei in the main courtyard of the Louvre Palace in Paris. It serves as the main entrance to the Louvre Museum and has a square base with 603 rhombus-shaped and 70 triangular glass segments.
The lateral surface of an object is all of the sides, excluding its base and top. The lateral surface area is the area of the lateral surface. Learn how to calculate it for different shapes such as cubes, prisms, cylinders, pyramids and cones.
A triangular bipyramid is a hexahedron with six triangular faces, constructed by attaching two tetrahedra face-to-face. Learn about its properties, symmetry, related polyhedra, and applications in geometry, chemistry, and color order systems.