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20790=1/4.22/7.d^2.15
20790=11.786.d^2
d^2=1763.36
d=√1763.36
d=42
jadi r=21
Luas permukaan =2.π.r. (r+t)
Luas permukaan =2.22/7.21.(21+15)
Luas permukaan =4752