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).
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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