(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The problem is in the attachment along with my answer. Can please one check if I got a correct answer?

Some sources say the answer is 2Pi instead of just Pi.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Evaluate the integral by interpreting it in terms of areas

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