2 squares of side 2x overlap to form a regular octagon. How long is each side of the octagon? Image of question: http://www.ucl.ac.uk/language-centre/placement-tests/UPC/Maths/images/question14.jpg The hint they gave is: Try again. If the middle piece of each side of the square is y, we get a right-angled triangle all of whose sides can be expressed in terms of x and y. Then apply Pythagoras's Theorem.
may you please explain, I do not get it at all. I saw the question posted already, howevr I cannot comment as i still do not have 50 reputations, also the answer they gave it was ununderstandable. may u plz provide a drawing. thank u