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d1: 24 cm
D2.d2… ?
D3.L=½ d1 x d2
642 cm²=½ 24 cm x d2
642 cm² × 2= 24 cm x d2
d2= 642 cm : 24 cm
d2= 26,75 cm
jadi panjang diagonal lainnya adalah 26,75 cm