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
Simple mechanical engineering. The [force is equal to mg sin (theta)](https://www.google.com/search?q=force+inclined+plane&rlz=1CAIGZW_enUS876US876&oq=force+incline&aqs=chrome.0.0j69i57j0l6.2941j0j1&sourceid=chrome&ie=UTF-8) where theta is angle of the incline.
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