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= 216 × 2 : 18
= 24 cm
216 cm² = 1/2 × 18 cm × d₂
d₂ = 216 cm² : 1/2 : 18 cm
d₂ = 216 cm² × 2 : 18 cm
d₂ = 432 cm² : 18 cm
d₂ = 24 cm
Jadi, panjang diagonal kedua dari belah ketupat tersebut adalah 24 cm.