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Why do you think is a football stadium rectangular??

football ground are straight and boxy, just like me (you cant play in a circle) (ask oliver in 1486)
the veb arena is trapezoid shaped, the parc des princes is oval and Bernabéu is a little rounded at the edges. it all depends on the architecture of the stadium.
<Comment deleted by user>
Who said circles don't have corners
It's itself is a corner