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96= 1/2.12.d2
96=6.d2
d2=96/6
d2=16
d1 = 12 cm
d2 = ??
Luas belahketupat = d1 x d2 /2
96 = 12 x d2 /2
96x2/12 = d2
16 = d2
jadi panjang diagonal lainnya / d2 adalah 16 cm