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K = 2p+2l
240 = 2.7x+2.5x
240 = 14x+10x
240 = 24x
x = 240:24
x = 10
jadi,l = 5x =5.10 = 50 cm
240 = 2(p+l)
p + l = 240/2 = 120
lebar = 5/(7+5) x 120 = 5/12 x 120 = 50 cm