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r = 9 cm
L = 4 x 3,14 x 9^2
= 1017,36 cm2
kita cari jari - jari dulu
Vbola = π r³
3.052,08 = 3,14 r³
3.052,08 = 4,18 r³
3.052,08/4,18 = r³
730,16 = r³
∛730,16 = r
9 = r
tinggal masukkan yang tadi pertama
Lpermukaan = 4 3,14 (9)²
= 1.017,36