multivariable calculus

[plush nimbus]

can someone explains to me why and how when i equate this multivariable function to 1 it gives me the surface area in my surface integration set up

[zinc ether]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with:

+close

3. Feel free to nominate the person for helper of the week in #helper-nominations
4. Do not ping the mods, unless someone is breaking the rules.
5. If you're happy with the help you got here, and the server overall, you can contribute financially as well:

[weary quarry]

same way $\int\int\int_V\dd{V}=\text{Vol}(V)$

[ripe orbit]

Omegabet_

[weary quarry]

you're just summing a bunch of infinitesimals of area, over the entire area

so you just get the area