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# A4 paper, simple rearranging

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1. Yeh, so I went to uni and did a Maths degree, but have been in work for the past 3 years and I cannot believe how rusty I have gotten, so don't judge haha.

I just can't seem to work out the attached highlighted and am convinced it is a mistake.

I get x/y = root 2, not one over.

Is this a small mistake on wiki?
Attached Images

2. You know what, it has to be root 2 with x being the longer side. So it is a typo.

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3. Yes it is an error. They call the long one x but arrive at xroot 2=y which means that y is longer than x which is a contradiction of their original definition of x.
4. you get x2/y2 = 2 when you cross multiply.

.... they have made a mistake

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