# Triple integral finding bounds?

1. Nov 1, 2008

### beallio

1. The problem statement, all variables and given/known data

Integrate the function over the solid given by the figure below (the bounding shapes are planes perpendicular to the x-y plane, a cone centered about the positive z-axis with vertex at the origin, and a sphere centered at the origin), if P=(0,0,5),Q=(0,4,3), and R=(sqrt(6),sqrt(10),0) .

https://instruct.math.lsa.umich.edu/webwork2_course_files/ma215-f08/tmp/gif/homework8b-prob1-pimages/sfig16-8-1g4.gif [Broken]

2. Relevant equations

3. The attempt at a solution
planes perpendicular to the x-y plane are the x-z plane and the y-z plane

how do you use the figure to get the bounds for x,y,z

I think that x is from 0 to R
then y is from 0 to 4
and z is from 0 to 5

is this correct? do I need to switch to spirical coordinates?

Last edited by a moderator: May 3, 2017
2. Nov 1, 2008

### tiny-tim

Welcome to PF!

Hi beallio! Welcome to PF!

No, "planes perpendicular to the x-y plane" means the y-z plane and the vertical plane through R.

The top surface is part of a sphere, and the "front surface" is also curved … it's the cone through Q.

Hint: divide the solid into horizontal slices of thickness dz, and integrate over z (split the integration into two parts … one below Q, and one above Q, since they'll be different functions).