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b=16cm
l=25cm
d²=6²+8²
d²=100/:√
d=10
H²+d²=l²
H²+100=625/-100
H²=525/:√
H=5√21
V=PP*H*1/3
Pp=192
V=192*5√21*1/3=320√21
Pc=Pp+Pb
Pb=2*a*H+2*b*H
Pb=160√21+120√21
Pc=192+280√21