Pentagon Information

A pentagon is a polygon with five sides and five angles. It is a two-dimensional geometric shape formed by connecting five straight line segments (sides) in a closed loop. Each interior angle of a regular pentagon (where all sides and angles are equal) measures 108 degrees. The sum of the interior angles in any pentagon is 540 degrees.

Pentagons can come in various forms, and their sides and angles may have different lengths and measures. Regular pentagons are often encountered in geometry and design, and they have a symmetrical and balanced appearance. In practical terms, pentagons might be found in certain architectural elements, decorative patterns, and various other contexts.

Pentagon Calculators

• Pentagon Area: Regular pentagon area from side length.
• Irregular Pentagon Area: Area from sides and diagonals.
• Pentagon Side Length: Side length of regular pentagon from area.
• Pentagon Volume: Volume of regular pentagon column.
• Pentagon Planter: Soil volume and planting surface area of a pentagon shaped raised planter.
• Water in a Pentagon Pond: Water to fill a pentagon (regular) shaped pond at depth.
• Dodecahedron Surface Area: Surface area of regular dodecahedron based on side length.
• Dodecahedron Volume: Volume of regular dodecahedron based on side length.

In three dimensions, twelve (12) regular pentagons can be fused to form a dodecahedron.  A dodecahedron is a three-dimensional geometric shape characterized by having 12 flat faces, 20 vertices (corners), and 30 edges. Each face is a regular pentagon.  Dodecahedra can be found in various natural and man-made forms. In geometry, they are studied for their interesting properties and symmetrical characteristics. In certain games and puzzles, dodecahedra may also be used as components or shapes.