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Did i do this correctly?

  1. Nov 12, 2009 #1
    A central angle theta is subtended by an arc 20cm long on a circle of radius 2m, find the radian measure of theta.

    i used the formula S=r(theta), and just plugged in what was given.

    20=200(theta), from there i got theta= 20/200, which gives me an answer of .1. I thought i did this correctly but my answer seems kind of weird. Did i do this correctly?
  2. jcsd
  3. Nov 12, 2009 #2


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    that should be correct. 200cm in relation to 2ocm arc is small
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