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r² =
=
= 400
r = √400
= 20 cm
t=15
r=?
v=½.πr².t
18.840=½x3,14xr².15
18.840=r²x23,55
r²=18.840÷23,55
r=800
r=√800
r=20√2
maaf banget kalo salah.