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3140= 3,14 x r2 x 10
3140= 31,4 xr2
r2= 3140 : 31,4 =100
r2=100
r= akar dri 100 =10
r=10
3140=3,14.r2 .10
r2=3140:3,14.10
r2=3140 : 31,4
r2=100
r= √100
r=10