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Hace 1 día · Each vertex of a square is 90°, so there is only one arrangement possible with three faces at a vertex, the cube. Pentagonal faces Each vertex is 108°; again, only one arrangement of three faces at a vertex is possible, the dodecahedron. Altogether this makes five possible Platonic solids.
Hace 1 día · 10 fm – the length of one side of a square whose area is one barn (10 −28 m 2), a unit of target cross section used in nuclear physics; 30.8568 fm – 1 quectoparsec (10 −30 parsecs) 100 femtometres. To help compare different orders of magnitude, this section lists lengths between 10 −13 m and 10 −12 m (100 fm and 1 pm).
