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r = d : 2
= 28 cm : 2
= 14 cm
t = 30 cm
π = 22/7
La = π × r²
= 22/7 × 14²
= 22/7 × 196
= 22 × 28
= 616 cm²
V = La × t
= 616 cm² × 30 cm
= 18.480 cm³
Jadi volumenya adalah 18.480 cm³
V = π x r² x t
= 22 / 7 x 14 x 14 x 30
= 44 x 420 = 18.480