1. a three-dimensional geometric figure with ten faces
Usage: geometry

Examples

• The student constructed a decahedron using cardboard and tape.
• A decahedron is more complex than a cube, which has only six faces.
• The geometry teacher explained how to calculate the surface area of a decahedron.
• Each face of the decahedron was painted a different color.
• The crystal formed a natural decahedron shape.
• Building a decahedron requires careful measurement of angles.