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pp= (a+b)/2*h
pp=(10+5)/2*4,5
pp= 7.5*4.5
pp=33,75
v= 33,75*10
V=337,5 cm^3
Pc= 2*pp + pb
Pc= 33,75*2+pb-----------------> pb= 2*a*c + 2*b*c-> 2*10*5+2*5*5=100+50=150
Pc=67,5+150
Pc=217,5