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D₂ = L × 2 ÷ D₁
D₂ = 36 cm × 2 ÷ 6 cm
D₂ = 72 cm ÷ 6 cm
D₂ = 12 cm
36 = 6 x d2 : 2
36 : 6 x 2 = d2
6x2 = d2
12 = d2