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1848 = 1/3 x 22/7 x r² x 9
1848 = 22/7 x r²x 3
1848/3 = 22/7 x r²
616 x 7/22 = r²
28 x 7 = r²
196 = r²
√196 = r
14 = r
jawabannya adalah 14 cm