(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Show that the volume of a sphere of radius r is

V = (4/3)πr^2

2. Relevant equations

calculus, integration

3. The attempt at a solution

I have the solution in the book but it's confusing me, I'll attach a picture.

So I get lost where it starts talking about a cross-sectional area all of a sudden multiplying by ∏. What's going on here?!

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# Volume of a sphere

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