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720 = 2x.5x /2
720 = 10x² /2
720.2 = 10x²
1440 = 10x²
1440/10 = x²
144 = x²
√144 = x
12 = x
panjang diagonal 1 = 2.12 = 24 cm
panjang diagonal 2 = 5.12 = 60 cm
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