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96 cm² = 12 cm × D₂ ÷ 2
D₂ = 96 cm² × 2 ÷ 12 cm
D₂ = 192 ÷ 12 cm
D₂ = 16 cm
96 = 12 x d2 : 2
96 x 2 : 12 = d2
d2 = 16