Guillotines chop heads. If you look at the guillotine blade, it is angled, with one side of the blade much higher than the other end. I would think the guillotine blade would be shaped more rectangular.
In: Engineering
Same reason why we have curved swords. Curves make the slicing easier. Because the blade curves away from the direction of the slice, a smaller cross section of the blade is in contact with the target, so more force can be delivered at a single point.
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