Use a piece of iron wire to form a rectangle that is 4 / 9 in width and 4 / 9 in length. If it is changed into a square, the length must be shortened by 3.5cm. How long is the iron wire?

Use a piece of iron wire to form a rectangle that is 4 / 9 in width and 4 / 9 in length. If it is changed into a square, the length must be shortened by 3.5cm. How long is the iron wire?

solution
Side length = 3.5 ÷ (1 / 2-4 / 9) = 63cm
Wire length = 63 * 4 = 252cm
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