Illustration of a plane passing through a cylinder. Every section of a cylinder made by a plane passing…

Illustration of the method of finding the projection, in the form of an ellipse, of the top of a cylinder…

Illustration of the projection of a cylinder whose axis is parallel to the plane of the paper and makes…

Illustration of a right circular cylinder with the height larger than the diameter.

Illustration of the plan and shaded elevation of a cylinder. The cylinder is viewed from the side and…

Illustration of a cylinder showing, "If a piece of paper is fitted to cover the convex surface of a…

Illustration of 2 narrow right circular cylinders with equal heights (thickness) and different diameters.…

Illustration of 2 right circular cylinders in which one cylinder is twice the height of the other.

Illustration of 2 right circular cylinders in which one cylinder is twice the height and twice the diameter…

Illustration of 3 right congruent tangent circular cylinders. The height of all the cylinders is greater…

Illustration of 3 right congruent tangent circular cylinders.

Illustration of 3 right congruent tangent circular cylinders. The height of all the cylinders is greater…

Illustration of 4 congruent tangent right circular cylinders. The height of all the cylinders is greater…

Pattern that can be cut out and folded to construct a regular dodecahedron. Fold on the dotted lines,…

Illustration of a regular dodecahedron. A regular dodecahedron is a polyhedron with twelve equal pentagonal…

A development or rolled out image exercise problem of the dome and finding the true shape of the hip,…

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…

Illustration of the projection of a hexagonal prism having two of its parallel sides parallel to the…

Illustration of the projection of a hexagonal prism whose axis is parallel to the plane of the paper…

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

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 showing the combination of a hexahedron and an dodecahedron.