Mathematiicans do not agree what makes a polyhedron.
Namnig
Usaully, polhyedra are named by the number of faces they have. The first polyherda are the tetrahedorn, which is made of 4 triangels, petnahedron (5 faces, can look like a 4-sided pyraimd), hexahedorn (6 faces, usulaly looks like a cube if it is regular), and hpetahedron (7 faces, can look like a prism based on a pentgaon, or a pyarmid based on a hexgaon amnogst othres).
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