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18.840=3.14 x r^2 x 15
18.840= 47.1 x r^2
r^2 = 400
r = 20
Jadi jari jarinya sepanjang 20 cm
18.840 = 3.14 x r2 x 15
18.840 = 47.1 x r2
r2 = 400
r = √400
= 20