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diket: v=3080
r=14
dit: t=...?
v=2πr^2t
3080=2×22/7×14×14×t
3080=2×4312/7×t
t=3080×7/8624
t=21560/8624
t=2,5cm
jawabannya adalah b.2,5cm
3.
diket; r=7
t=10
dit: v=..?
v=πr^2t
=22/7×7×7×10
=22/7×490
=1540cm^3
jawabannya adalah c.1540cm^3
jika ada yg tidak anda pahami silahkan comment:)