Why do monocrystalline solar cells have rounded/cropped edges?

cemtu
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Homework Statement
Why do monocrystalline solar cells have rounded/cropped edges? And why do solar cells need to be square-shaped in general?
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There were circular solar cells 30 years ago. Why do we have square-shaped solar cells now? Why square now?
 
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Rectangles pack better than circles. Seems that individual cells also assume a rectangular shape. .
mono-and-poly-silicon-cells.jpg
 
Way I understand it, the outside of the boule tends towards polycrystalline formation (mono is preferable).
 
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