2*(1*7)+2*(7*9)+2(1*9) = 14+126+18 =158cm2
Pb=(1*7)*4=28
Ppb=28*4=112
Pp=1*7*2=14
Ppc=14+112=126
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2*(1*7)+2*(7*9)+2(1*9) = 14+126+18 =158cm2
Pb=(1*7)*4=28
Ppb=28*4=112
Pp=1*7*2=14
Ppc=14+112=126