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d₂ = y
d₁ = 3/4y
LP = 2(La) + (Ka × t)
648 = 2(1/2 × d₁ × d₂) + ((4 × s) × t)
648 = 2(1/2 × y × 3/4y) + ((4 × 10) × 15)
648 = 2(3/8y²) + (40 × 15)
648 = 6/8y² + 600
648 - 600 = 6/8y²
48 = 6/8y²
384 = 6y²
64 = y²
√64 = √y²
8 = y
d₁ = y
= 8 cm
d₂ = 3/4y
= 3/4(8)
= 6 cm