# limit of angle

#### xl5899

can someone explain about the limit of ∅ is taken from 0 to pi only? [FONT=&quot]
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#### Archie

Just think about what parts of the sphere are covered by $$\displaystyle (\rho,\theta)$$ for each individual value of $$\displaystyle \phi$$.

These questions about limits on multiple integrals are almost pure geometrical questions. If you can visualise what is going on, you will have your answers.