While watching the finals of the #fwc2014 last night, the commentator said something to the effect: ‘Germany will be relieved to go to halftime with the score still square’. And I think for the first time I considered what the square in 'fair and square’ means and I came to deduction that it must have came from the fact that a square has equal sides.
I did check it out and found I was right (high fives self):
An agreement that is equitable on all sides is a “square deal”.
Anyway, that little term may have not been very useful or interesting to you, but I bet this little gif (Construction of a square using a compass and straightedge.) will be: