Volume of liquid in a sphere.

[ggauny@live.fr]

Hi,

In a exercize I have, it is asked to proove this is good (Would you see first attachement ?).

Because I don't know how to to by hand, I have asked Prime but Prime himself
don't knows the answer, taylor seem absent. (Would you see second attachement ?), but give me an answer wich is bad. Would you see third attachement ?).

I don't love ask a computer what is the solution without know do by hand
because it is too simple.

Thanks.