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2πrt = 2 × 22/7 × 14 × t
1408 = 2 × 44 × t
1408 = 88 × t
t = 1408/88
= 16 cm
luas permukaan tabung :
2πr(r+t) = 2 × 22/7 × 14 (14+16)
= 2 × 44 × 30
= 88 × 30
= 2640 cm