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a=3cm
h=4cm
Pp=½*3*4
Pp=1,5*4
Pp=6cm²
Pb=3*10+4*10+5*10
Pb=30+40+50
Pb=120cm²
Pc=2Pp+Pb
Pc=2*6cm+120cm
Pc=12cm+120cm
Pc=132cm²