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L = 60 cm²
D1 = 8 cm
maka :
L = (D1 x D2) / 2
60 = (8xD2)/2
60 X 2 = 8D2
120 = 8D2
D2= 120/8
D2 = 15 cm
60 = 8 x d2 /2
60 x 2 / 8 = d2
15 = d2
jadi panjang diagonal lainnya adalah 15 cm