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Old 04-24-2013, 12:01 AM
arbipher arbipher is offline
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Join Date: Jul 2012
Location: Shanghai, China
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Default *ANSWER* Q10 - into a Polar coordinate system

I find it's easy to solve the question in a polar coordinate system,
in which we can depict an arbitrary point as:
(r, theta)
, where r is the radius and theta is the angle.

The region in two concentric circles is
(r, theta)
, where a <= r <= b and theta is arbitrary.

Now it's easy to realize that the answer to this question should be identical to "1-interval" demonstrated in the lecture.
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