Illustration of a pentagonal antiprism. An antiprism is formed by having two parallel congruent bases…

Illustration of a pentagonal antiprism. An antiprism is formed by having two parallel congruent bases…

Illustration of a pentagonal antiprism. An antiprism is formed by having two parallel congruent bases…

Illustration of a skewed (non-right) pentagonal antiprism. An antiprism is formed by having two parallel…

Illustration of a pentagonal bipyramid. A bipyramid, or dipyramid, is formed by joining two congruent…

Illustration of a pentagonal bipyramid. A bipyramid, or dipyramid, is formed by joining two congruent…

Illustration of pentagon inscribed in circle. Or, circle circumscribed about pentagon.

Illustration of polygon circumscribed about circle. Or, circle inscribed in the polygon.

Illustration of polygon inscribed in circle. Or, circle circumscribed about the polygon.

Right circular cylinder inscribed in a pentagonal prism. Or, Pentagonal prism circumscribed about a…

A flashcard featuring an illustration of a polygon with five equal sides

A flashcard featuring an illustration of a Pyramid with a Pentagonal Base

Illustration of regular hexagon and triangle inscribed in circle.

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,…

An illustration showing how to construct a pentagon on a given line without resort to its center. "From…

Regular pentagon inscribed in a circle, circumscribed about a circle.

Illustration of a how to construct a pentagon similar to two given pentagons.

Illustration of a cyclic pentagon, a pentagon inscribed in a circle. This can also be described as a…

Illustration of pentagon inscribed in circle. Or, circle circumscribed about pentagon. Construction…

"An involute is a curve generated by unwrapping an inflexible chord from around a polygon. Thus the…

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Illustration showing a circle inscribed in a regular pentagon. Or, a regular pentagon circumscribed…

Pentagon with dimensions labeled. Pentagon can be used to calculate area by calculating individual triangles…

"This is bounded by twelve pentagonal faces, but these are not regular pentagons, and the angles over…

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…

Illustration of 2 regular congruent pentagons that have the same center. One pentagon has been rotated…

Illustration of 4 regular congruent pentagons that have the same center. Each pentagon has been rotated…

Illustration of 8 regular congruent pentagons that have the same center. Each pentagon has been rotated…

Illustration of crossed polygon. This is not generally considered to be a real polygon.