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keliling lingkaran = 66 = 2πr
cari r dulu...
66= 2πr
33 = πr
r = 33/3,14
r = 10,5
L bola = 2 (2πr) r
L bola = 2 (66) 10,5
L bola = 1386
jadi bahan yang digunakan untuk melapisi kulit bola tsb, adlaah 1386 cm²