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luas = 1/2 x d1 x d2
120 = 1/2 x 24 x d2
d2 = 120 /12
d2 = 10 cm
120 cm² = 24 cm × D₂ ÷ 2
D₂ = 120 cm² × 2 ÷ 24 cm
D₂ = 240 cm² ÷ 24 cm
D₂ = 10 cm