I may have misinterpreted this but today in calculus (AB) we were forming solids from 2 dimensional equations. One of the methods involved taking an integral of an area equation to solve for a solids volume. I got very excited as I often have difficulty remembering volume equations but am familiar with the basic area ones, so I thought I had found my solution to finding the volume of something with an area equation. However, when I tried to take the integral of the equation for the area of a circle ((pi)r^2) I came up with the equation (((pi)r^3)/3)+C which, as you may know, is not the equation for the volume of a sphere (4(pi)r^3)/3 although it is awfully close. I am very new to this so I'm definitely looking at this the wrong way so if any one could explain this to me or send me any good links that would be awesome!