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K = 2 ( p + l )
48 = 2 ( x + x-4 )
48 = 2 ( 2x -4)
24 = 2x - 4
24+4 = 2x
28= 2x
14 = X , lebar = 14 - 4 = 10
luas = p x l
= 14 x10
= 140 cm2