Illustration of a conical bifrustum created by three parallel planes of circles with the middle plane…

Illustration of a decagonal bifrustum created by three parallel planes of decagons with the middle plane…

Illustration of a hexagonal bifrustum created by three parallel planes of hexagons with the middle plane…

Illustration of a octagonal bifrustum created by three parallel planes of octagons with the middle plane…

Illustration of a square bifrustum created by three parallel planes of squares with the middle plane…

A cone is a solid whose base is a circle, and whose convex surface tapers uniformly to a point called…

Illustration of a decagonal pyramid that has been cut by a plane parallel to the base. The top section…

Illustration of a hollow decagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a decagonal pyramid that has been cut by a plane parallel to the base. The top section…

Illustration of a hollow septagonal/heptagonal pyramid that has been cut by a plane parallel to the…

If a pyramid be cut by a plan parallel to the base, so as to form two parts, the lower part is called…

Diagram used to prove the theorem: "The volume of the frustum of a pyramid (cone) is equal to the sum…

The frustum of a pyramid is the portion of a pyramid included between the base and a section parallel…

The frustum of a triangular pyramid is equivalent to the sum of three pyramids whose common altitude…

Two pyramids and a sphinx near Gizeh, Egypt, built during the 25th century. These three structures rank…

Illustration of a right hexagonal pyramid that has been cut by a plane parallel to the base. The lower…

Illustration of a frustum of a hexagonal pyramid (including cross-section).

Illustration of a right hexagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a right hexagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a right hexagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a skewed hexagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of the intersection of a hexagonal pyramid and a plane.

Illustration of the projection of a hexagonal pyramid that is in a right position.

Illustration of the projection of a hexagonal pyramid that is obliquely inclined.

Illustration of the bottom part of an icosahedron. The base consists of a regular pyramid, upon which…

Illustration of the steps to a construction of an icosahedron. The base consists of a regular pyramid,…

Illustration of a hollow nonagonal pyramid that has been cut by a plane parallel to the base. The top…

A problem exercise creating a stretched out or developed image of the octagonal light shade by using…

Illustration of a right octagonal pyramid, with hidden edges shown, that has been cut by a plane parallel…

Illustration of a right octagonal pyramid that has been cut by a plane parallel to the base. The lower…

Illustration of a hollow octagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a frustum of a pentagonal pyramid (including cross-section).

Illustration of a right pentagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a hollow pentagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a right pentagonal pyramid, with a height much larger than the edge lengths of the base,…

Illustration of a right pentagonal pyramid, with a height smaller than the edge lengths of the base,…

Illustration of a hollow pentagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of a skewed pentagonal pyramid that has been cut by a plane parallel to the base. The top…

Diagram used to prove the theorem: "If a pyramid is cut by a plane parallel to the base, the edges are…

A volume of a truncated right triangular prism is equal to the product of its base by one third the…

A volume of a truncated right triangular prism is equal to the product of its base by one third the…

Diagram showing how "A truncated triangular prism is equivalent to the sum of three pyramids whose common…

A truncated triangular prism is equivalent to the sum of three pyramids, whose common base is the base…

A truncated triangular prism is equivalent to the sum of three pyramids, whose common base is the base…

A pyramid is a solid whose base is a plan figure, and whose sides are triangles uniting at a common…

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid…

Illustration of a right decagonal pyramid. The base is a decagon and the faces are isosceles triangles.…

A sample exercise problem in completing the top part of the hexagonal pyramid and to create a development,…

A pentagonal pyramid problem exercise to complete the top view of the image, and development, or rolled…

Illustration of the development of a pyramid. When the pyramid covered in paper (figure a) is rolled…