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Pp = 6*a²√3/4
Pp = 6*4²√3/4
Pp = 24√3
H²+a² = b²
H²+4² = 9²
H² = 81-16
H² = 65
H = √65
Hb²+(1/2a)² = b²
Hb²+2² = 9²
Hb² = 81-4
Hb² = 77
Hb = √77
V = 1/3*Pp*H
V = 1/3*24√3*√65
V = 8√195 cm³
Pc = Pp+Pb
Pb = 6*1/2*a*Hb
Pb = 3*4*√77
Pb = 12√77
Pc = 24√3+12√77
Pc = 12(2√3+√77) cm²