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a=17,5
70=1,75b
b=40
Pb=4*40*17,5=2800
1,75h=70 /:1,75
h=40cm
2a+2b=70cm
2(a+b)=70cm
a+b=35cm
Pb=2*(a+b)*H
P=2*35*40
P=2800cm²