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Math Help - Area and Polar Curve

  1. #1
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    Area and Polar Curve

    Find the area enclosed by one loop of the following polar curve...

    r=8cos(5theta)

    I have no idea how to start this..can someone help?
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  2. #2
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    Quote Originally Posted by Jgirl689 View Post
    Find the area enclosed by one loop of the following polar curve...

    r=8cos(5theta)

    I have no idea how to start this..can someone help?
    double the area of half a loop ...

    2 \int_0^{\frac{\pi}{10}} 32\cos^2(5\theta) \, d\theta
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