# I Derivation for the volume of a cone

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1. Dec 23, 2016

### Phys12

In the derivation, when I started, instead of having the top of the cone touching the y-axis, I made its base touch the y-axis and derived the equation by that. Because of that, my equation for y was rx/h + r, instead of rx/h. And the answer that I got was incorrect. How do I get the write formula by putting the base of the cone on y-axis?