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d=10
r=5
100%---------5
160%------------h
h=160*5/100=8
P= 10pi * 8= 80pi cm2
Pk=10 PI
2 PI r = 10 PI /PI
2r=10/2
r=5
h=5 *60%=3
h=10+3=13
Ppb= 2PI*r*h
Ppb=2PI*5*13
Ppb=2PI*65/2
Ppb=32,5 PI cm kw