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*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 "1interval" demonstrated in the lecture. 
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