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lebar = 5x
Panjang = 7x
keliling 2(p+l)
keliling = 2(7x+5x)
keliling = 2(12x)
keliling = 24x = 240cm
x = 240/24 = 10cm
p = 7x = 7*10 = 70
l = 5x = 5*10 = 50
L = p*l = 50*70 = 3500cm persegi