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a√2 = 8√2
a= 8
Pp= 8*8
Pp= 64
Pb = 4 * 8√2 * 8
Pb= 256√2
Pc= 256√2 + 64 + 64
Pc= 256√2 + 128
b)
Pp= a² √3/4
Pp= 2 ²√3/4
Pp= 4√3/4
Pp=1√3
Pb= 3 * 2 * 2√3
Pb= 12√3
Pc= 12√3+1√3 +1√3
Pc= 14√3