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jawab

Pipa1 , d1 = 25 cm , r1 = 12,5
Pipa2, d2  = 2,5 cm , r2 = 1,25

banyak pipa 2 yang di butuhkan = L1/L2
n = π r₁² / π r₂²

n=  (12,5 / 1,25)²
n = (10)²
n = 100