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Can someone explain how to do this problem??

 Feb 9, 2019
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Circumference of larger circle = pi d =   18 pi

smaller circle = 4 pi

 After 20 revolutions the smaller circle travels 20 * 4 pi = 80 pi

    18 pi is one complete travel around the larger circle

     80 pi -   18 pi *4    = 8pi  = the tangent point

 

8pi /18pi  x 360 = 160 degrees.  

 Feb 9, 2019

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