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4.3.14.30.30 sama dengan 4.314.9 sam dengan 11.304
= 4 x 3,14 x 30 x 30
= 4 x 314 x 3 x 3
= 4 x 314 x 9
= 36 x 314
= 11.304 cm²
Jadi, luas permukaan bola itu 11.304 cm²