Table of Contents

## How do you integrate with cylindrical coordinates?

To evaluate a triple integral in cylindrical coordinates, use the iterated integral ∫θ=βθ=α∫r=g2(θ)r=g1(θ)∫u2(r,θ)z=u1(r,θ)f(r,θ,z)rdzdrdθ. To evaluate a triple integral in spherical coordinates, use the iterated integral ∫θ=βθ=α∫ρ=g2(θ)ρ=g1(θ)∫u2(r,θ)φ=u1(r,θ)f(ρ,θ,φ)ρ2sinφdφdρdθ.

## Does order of integration matter for spherical coordinates?

In general integrals in spherical coordinates will have limits that depend on the 1 or 2 of the variables. In these cases the order of integration does matter.

## How to find an integral in cylindrical coordinates?

Suppose we have a surface given in cylindrical coordinates as and we wish to find the integral over some region. We could attempt to translate into rectangular coordinates and do the integration there, but it is often easier to stay in cylindrical coordinates.

## When do you use a cylindrical coordinate system?

This coordinate system works best when integrating cylinders or cylindrical-like objects. As with spherical coordinates, cylindrical coordinates benefit from lack of dependency between the variables, which allows for easy factoring. Recall the coordinate conversions.

## Which is the triple integral for a circular cylinder?

This means that the circular cylinder x2 + y2 = c2 in rectangular coordinates can be represented simply as r = c in cylindrical coordinates. (Refer to Cylindrical and Spherical Coordinates for more review.) Triple integrals can often be more readily evaluated by using cylindrical coordinates instead of rectangular coordinates.

## How to evaluate a triple integral in spherical coordinates?

Evaluate a triple integral by changing to spherical coordinates. Earlier in this chapter we showed how to convert a double integral in rectangular coordinates into a double integral in polar coordinates in order to deal more conveniently with problems involving circular symmetry.