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= π x r² x 3/4 x 2
= 3,14 x 10² x 3/4 x2
= 3,14 x 100 x 3/4 x 2
= 314 x 3/4 x 2
[2 dan 4 disederhanakan menjadi : ]
= 314 x 3/2
[314 dan 2 disederhanakan menjadi : ]
= 157 x 3
= 471 cm²