In a platonic solid all faces are identical regular polygons. A polyhedron has faces, edges, and vertices. The numbers of each are related by Euler's formula, V+F=E+2
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equilateral triangles and regular pentagons
A solid with a regular polygon for each face is known as a perfect solid.
A face
A decaredra is the ten face solid figure.
The sum of the areas of each face of the solid.