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t=10 dm
dit= r?
V= vr2.t
1540dm3= 3.14.r2. 10dm
1540dm3= 31,4dm. r2
r2= 1540dm3 : 31,4 dm
= 49dm2
r= akar 49dm2
= 7dm.
1540 dm3 = 3.14 x r x r x 10 dm
1540 dm3 = 31.4 x r x r
49 dm = r x r
7 dm = r