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Pp=64√3 cm²
Pc=2Pp +3*1/2 aH
a=?
Pp=a²√3/4
a²=4Pp/√3
a² =4*64√3/√3
a²=256
a=√256
a=16cm
Pc=2*64√3 + 3*16*20/2
Pc=(128√3 +480) cm²