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60 = 8 x d2 x 1/2
60 = 4 x d2
60 : 4 = d2
15 = d2
maka diagonal lainnya adalah 15 cm
L = 60 cm²
d1 = 8 cm
dit : d2 ?
maka :
L = (d1xd2) / 2
60 = (8 x d2)/2
60 x 2 = 8d2
d2 = 120/8
d2 = 15 cm