# Volume of a solid

1. Feb 4, 2012

### bobsmith76

1. The problem statement, all variables and given/known data

3. The attempt at a solution

I dont' see why you don't take the antiderivative of pix^(1/2) which makes it

(2pix^(3/2))/3

2. Feb 4, 2012

### jbunniii

Because the integrand is $\pi [\sqrt{x}]^2$, not $\pi \sqrt{x}$.

3. Feb 4, 2012

### bobsmith76

thanks. my book did a real poor job of explaining that.