An illustration of two children, one standing and one resting on its knees, looking at an intricately…

Represents a combination of a pentagonal dodecahedron and cube, and are common in pyrites.

Represents the combination of pentagonal dodecahedron, cube, and octahedron.

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…

"A cube is a prism whose faces are ends are squares. All the faces of a cube are equal." —Hallock…

"A combination of cube and pyritohedron, in which it will be noted that the faces of the pyritohedron…

"A combination of cube and tetrahedron. It will be noted that the tetrahedron faces truncate the alternate…

"A cube with its edges beveled by the faces of a tetrahexahedron." — Ford, 1912

A cube (A) has sides of 20 inches in length each, making its solid contents equal 8000 cubic inches.…

In order to fill in the spaces from the three 2000 cubic inch additions, four new additions must be…

This is the final form of the original 20x20x20 inch or 8000 cubic inch cube with the addition of 7625…

Represents the combination of an octrahedron and a cube, with the cube faces predominate.

"A combination of cube, dodecahedron, and tetrahedron." — Ford, 1912

"When a corner or an edge of one form is replaced by a face of another form, the first is said to be…

An illustration of a cube divided into 6 equal pyramids to illustrate how volume can be found.

Illustration of 108 congruent cubes stacked at various heights. A 3-dimensional representation on a…

Illustration of 117 congruent cubes stacked in columns of one, four, and six. A 3-dimensional representation…

Illustration of 128 congruent cubes stacked so they form a rectangular solid that measures 4 by 4 by…

Illustration of 132 congruent cubes stacked in 22 columns of 6 in the shape of a U. A 3-dimensional…

Illustration of 154 congruent cubes stacked in columns increasing from one to four. A 3-dimensional…

Illustration of 16 congruent cubes stacked at various heights. A 3-dimensional representation on a 2-dimensional…

Illustration of 17 congruent cubes stacked in ones and twos in the shape of a V. A 3-dimensional representation…

Illustration of two congruent cubes that are tangent along an edge. A 3-dimensional representation on…

Illustration of 20 congruent cubes stacked in twos and threes. A 3-dimensional representation on a 2-dimensional…

Illustration of 20 congruent cubes stacked at various heights. A 3-dimensional representation on a 2-dimensional…

Illustration of 20 congruent cubes stacked at heights increasing from 1 to 4 cubes. A 3-dimensional…

Illustration of 22 congruent cubes stacked in ones, twos, and threes. A 3-dimensional representation…

Illustration of 22 congruent cubes stacked at various heights. A 3-dimensional representation on a 2-dimensional…

Illustration of 24 congruent cubes stacked at various heights to resemble steps. A 3-dimensional representation…

Illustration of 256 congruent cubes stacked so they form 4 larger cubes that measures 4 by 4 by 4 each.…

Illustration of 27 congruent cubes stacked to resemble a larger cube that measures three by three by…

Illustration of 27 congruent cubes stacked at various heights in the shape of a W. A 3-dimensional representation…

Illustration of 28 congruent cubes placed in the shape of a square. A 3-dimensional representation on…

Illustration of 30 congruent cubes stacked in decreasing heights. A 3-dimensional representation on…