This is a square in polar coordinates

A square? A square?! Wake up sheeple! That things not even a rombus! Don’t you see the lies? Look at the lines! Look! Not all rhombuses are squares, but all squares are rhombuses! All squares are rhombuses and look at this thing they try to call a square. Where are the parallel lines? There’s got to be parallel lines, don’t you see, or then it’s not a rombus and all squares are rhombuses. Don’t forget that, don’t let them take that fact from you and perpetuate their geometric lies. Does no one even remember what a rombus is? This is, this is basic geometry here that you should have learned in middle school or elementary school, but then you just forget it, and let people trick you with these misleading definitions and fancy diagrams but you have to remember that a Square. Is. A. Rombus.

This has an infinite number of sides

270°≠90°

You could say a regular square has 4 270° exterior angles