## Lecture 25: Triple integrals in rectangular and cylindrical coordinates

Lecture 25: Triple integrals in rectangular and cylindrical coordinates
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Taught by OCW
Denis Auroux. 18.02 Multivariable Calculus, Fall 2007. (Massachusetts Institute of Technology: MIT OpenCourseWare). http://ocw.mit.edu (Accessed March 21, 2009). License: Creative Commons Attribution-Noncommercial-Share Alike.
Learn how to compute triple integrals using both rectangular and cylindrical coordinates.
• How do you compute a triple integral?
• What does it mean to find a triple integral?
• How do you find a triple integral using rectangular, polar, or cylindrical coordinates?
• How do you find the triple integral of 1 dV between the paraboloids z = x^2 + y^2 and z = 4 - x^2 - y^2?
• How do you know what order to write dx, dy, and dz when doing a triple integral?
• What are cylindrical coordinates?
• What are some applications of finding triple integrals?
• How do you find the moment of inertia of a 3-dimensional solid cone?
• How do you set up a triple integral for the region z > 1 - y inside the unit sphere centered at the origin, x^2 + y^2 + z^2 < 1 using rectangular coordinates?
This lesson starts the transition from two dimensions into three dimensions. Flux, curl, work, integrals, and all other topics are simply moved into space from the plane. Triple integrals in rectangular and cylindrical coordinates are explained in this lecture. It is very important that you have a firm understanding of how double integrals work in the plane before trying to tackle this lesson. Some very involved examples are shown using rectangular, polar, and cylindrical coordinates. This is a very interesting but possibly confusing lesson.
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Reviewed by MathVids Staff on March 22, 2009.