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Verified answer
Panjang = 4xlebar = 3x
kll persegi panjang = 2(p+l)
42 = 2(4x+3x)
42 = 2(7x)
42 = 14x
x = 42/14
x = 3
panjang = 4x = 4×3 = 12cm
lebar = 3x =3×3 = 9cm
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