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Perbandingan panjang = 3 : 2
K = 40 cm
maka :
K = 2 x (p+l)
40 = 2 x (3x+2x)
40 = 2 x (5x)
40 = 10x
x = 40/10
x = 4
jadi panjang = 3 x 4 = 12 cm
lebar = 2 x 4 = 8 cm