If I intergrate 2(pi)r I get (pi)r^2(adsbygoogle = window.adsbygoogle || []).push({});

If I integrate that I get 1/3 (pi)r^3, which is close to the volume of a sphere. But where do I get a 4/3(pi)r^3 ?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Small question

**Physics Forums | Science Articles, Homework Help, Discussion**