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
I feel like this would be a pressure = force/area thing. So if the full blade makes connection at once, the force is evenly spread over a larger area.
Kinda like how if push on a peice of wood with your thumb nothing happens. But apply the same force with a small area (like a pin) you can push into the wood.
So by having an angle, you have the same force on a smaller area at the start, so a much higher pressure.
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