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L = 90 cm²
D1 = 12 cm
maka :
L = (D1xD2)/2
90 = (12xD2)/2
90 x 2 = 12D2
D2 = 180/12
D2 = 15 cm
jdi pnjang Diagonal lain = 12 cm
= 90 : 12 x 2
= 15 cm