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Da = Db
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 8/2 = 4
Maka
Da = 5x = 5(4) = 20cm
Db= 3x+8 = 3(4)+8= 12+8 = 20cm
5x-3x = 8
2x = 8
x = 8 : 2
= 4 cm
panjang diagonal = 5x cm
= 5(4) cm
= 20 cm