Plan, front, and side views of a square pyramid after revolving pyramid through 30° with vertical…

Plan, front, and side views of a square pyramid after revolving pyramid through 30° with horizontal…

Illustration of triangular pyramid used to show that the volume is the limit of the sum of the volumes…

Illustration of triangular pyramid used to show that the volume is equal to one third of the product…

Illustration of 2 right pentagonal pyramids with hidden edges shown. The pentagonal bases are congruent,…

Illustration of 2 right rectangular pyramids with hidden edges shown. The rectangular bases are congruent,…

Two triangular pyramids having equivalent bases and equal altitudes are equivalent.

Illustration of pentagonal and triangular pyramids cut by a plane parallel to the bases.

Illustration of 2 similar right pentagonal pyramids with hidden edges shown. The height of the pyramid…

Illustration showing that the volume of 2 triangular pyramids, having the same trihedral angle of the…

Illustration of the development of a rectangular prism. "Assume now that the prism is laid on the drawing…

Illustration of the projection of a rectangular prism that is represented as if it were standing on…

Illustration of the projection of a rectangular prism whose broad side makes an angle of 30° with…

Illustration of the projection of a rectangular prism whose base makes an angle of 160° with the…

Illustration of the projection of a rectangular prism whose base makes an angle of 17.5° with the…

Illustration of a 5 in. by 3 in. by 4 in. rectangular solid with each cube in the solid representing…

Illustration of a 1 in. by 2 in. by 1 in. rectangular solid that is similar to a 2 in. by 4 in. by 2…

Illustration of a the bottom half of a regular dodecahedron. A regular dodecahedron is a polyhedron…

Illustration containing a tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron, placed…

Illustration of an irregular solid form made up of triangular surfaces on a flat surface.

Illustration of an irregular solid form made up of triangular surfaces unfolded on a flat surface. A…

Illustration showing the development of a sphere by the perspective of its resolved cones.

Illustration showing that "the solids formed by the dissected part of the sphere are pyramids."

Projection of a square bar with a cylindrical portion.

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

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

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

The volumes of two similar tetrahedrons are to each other as the cubes of their homologous (corresponding)…

Diagram used to prove the theorem: "Two tetrahedrons having a trihedral angle in each equal, are to…

The exercise problem of creating a three piece elbow development or rolled out image of the cylinder…

Projections of a triangular prism or block with a square hole.

Diagram used to prove the theorem: "The volume of a triangular prism is equal to the product of its…

Exercise problem to develop, or rolled out, image of the triangular pyramid by creating an equal length…

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

Diagram used to prove the theorem: "The volume of a triangular pyramid is equal to one third of a triangular…

Diagram used to prove the theorem: "Two triangular pyramids having equivalent bases and equal altitudes…

"The cone B would be developed by cutting a right section as S—S whose stretchout will be a circle…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its triangular…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its rectangular…

Illustration of the projection of a wedge of a rectangular prism that is viewed from the side.