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**Help!!! Plane motions rolling wheel**

Hi there, I am not having any luck with this question at all and am hoping that there is someone out there that can help me out..... here goes:

The below cyclinder rolls to the right at 10 in/sec. Determine the angular velocity of BC and CD

I am actually trying to prepare for a midterm and am not getting anywhere close to the answers that I am supposed to get.

I am using the following formulas: Vb= Vc/b + Vc

I know for the radius of Vb that would be 12" + 6"/2 = 9"

the biggest challenge for me I guess is when drawing the triangle, I am not getting the right angles, therefore, my answer is not correct.

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