Why is the volume of a cone 1/3*pi*r^2*h? Here's a proof with the disc method! Calculus basics

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18 year old students just discovered a proof of Pythagoras that mathematicians said was impossible
MindYourDecisions
Does L'Hôpital's rule work for this? It's 0/0 so indeterminate! Reddit r/calculus
bprp calculus basics