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Pp= 6 *a² √3/4
a=7cm
Pp= 6*7²√3/4
Pp=6*49√3/4
Pp=73,5√3 cm²
Pp=147√3
Pb= a*h
h=20cm
Pb=6*20
Pb=120 cm²
P= 147√3cm² + 120cm²