See also:

• ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a face or base)

ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a See also:

• FACE (from Lat. fades, derived either from facere, to make, or from a root fa-, meaning " appear "; cf. Gr. cbatvstv)

face or See also:

• BASE

base)  , in See also:

• GEOMETRY

geometry, a solid enclosed by twenty faces . The " See also:

• REGULAR

regular See also:

• ICOSAHEDRON (Gr. e'IKOVL, twenty, and Ebpa, a face or base)

icosahedron " is one of the Platonic solids; the " See also:

• GREAT

great icosahedron " is a See also:

• KEPLER, JOHANN (1571-1630)

Kepler-See also:

• POINSOT, LOUIS (1777–1859)

Poinsot solid; and the " truncated icosahedron " is an Archimedean solid (see See also:

• POLYHEDRON (Gr. rain, many, ESpa, a base)

POLYHEDRON) . In See also:

• CRYSTALLOGRAPHY
• CRYSTALLOGRAPHY (from the Gr. Kpbo TaXXO , ice, and -ypachew, to write)

crystallography the icosahedron is a possible See also:

• FORM (Lat. forma)

form, but it has not been observed; it is closely simulated by a See also:

• COMBINATION (Lat. combinare, to combine)

combination of the See also:

• OCTAHEDRON (Gr. 6K-rw, eight, Mpa, base)

octahedron and pentagonal See also:

• DODECAHEDRON (Gr. Melia, twelve, and ESpa, a face or base)

dodecahedron, which has twenty triangular faces, but only eight are equilateral, the remaining twelve being isosceles (see CRYSTALLOGRAPHY) .