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Luas permukaan bola = 4×π×r² = 210
π×r² = 210/4
π×r²= 52,5
Luas permukaan tabung = 2×π×r (r+t)
2×π×r (r+2×r)
2×π×r×(3r)
6×π×r²
6×52,5 = 315 cm²
Jadi, luas permukaan tabung = 315 cm²