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175%x=70cm
x=70:1,75=40cm
Pb=70×40=2800cm²
2a+2b= 70
h= ????
70 ----- 175 %
X------- 100%
X*175=70*100
X= 7000/175
x=40
x=h
Ppb=70*40
Ppb=2800 cm2