# How to calculate one side of an arbitrary square

Firstly, sorry for my silly or simple question, and sorry for my bad English.
I have an arbitrary square which is like this:

Maybe it can be solved with Pythagoras by splitting into two triangle
Can someone please explain me how to solve this problem?

Need to be verify:

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and what is the angle between the 1cm side and the 64cm side? or is there 1 more condition? it seems like you forgot to mention something – Mr.T Jul 9 '14 at 10:02
Are the 0.5cm and 1cm sides parallel? – George Daccache Jul 9 '14 at 10:09
yes it is parallel, @Mr.T i just want to ask, what happen if the angle is unknown? The angle between 1cm and 64 cm it is 90.8 degrees. – Newbie123 Jul 9 '14 at 10:16
If the angle is unknown, you can rotate the 1cm side whatever you want (still satisfy the condition of the problem), therefore $x$ is not determined :) – Mr.T Jul 9 '14 at 10:17
@Mr.T Thank you for you explanation :) what if the angle is known like 90.8 (i have updated my image) how to solve it? – Newbie123 Jul 9 '14 at 10:28