a is drawn to scale because 10 cm=5 cm*2 and if measure it that side is exactly two of the 5 cm side. for the 25 cm it should be the same length as the 5 cm side and 20 cm side altogether. B isn't drawn to scale because the 40 cm side should be double the length of the 20 cm side, but it's less than the double the 20 cm side.
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