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V = La x t
9420 = La x 30
La = 314
karena alasnya berbentuk lingkaran jadi rumus luas lingkaran
Ll = π r² π = atau 3,14
314 = 3,14 r² r² = 314 : 3,14
r² = 100
r = 10
d = 2xr
d = 20
9420 = La x 30
La = 314
La = π r^2
314 = 3,14 r^2
r^2 = 314 : 3,14
r^2 = 100
r = V100
r= 10
d = 2 x r
d = 20