title: How to convert Degree to polar coordinates in iOS
body: <p>I draw a circle in UILabel. I set start degree and end degree for circle. Now I want to add imageview to this circle label that polar coordinates of Imageview match with end degree of cirle. So that, I want to convert end degree of circle to polar coordinates. Example:</p>
  
  <pre><code>Width of UILabel = 62
  Height of UILabe = 62
  Start degree of cirle in UILabel  = 0 (degree)
  End degree of cirle in UILabel  = 150 (degree)
  </code></pre>
  
  <p>I added UIImageView(pointImgView) to this UILabel as below</p>
  
  <pre><code>  UIImageView *pointImgView = [[UIImageView alloc] initWithFrame:CGRectMake(x, y, 6, 6)];
   [self addSubview:pointImgView];
  </code></pre>
  
  <p>I don't know how to convert End degree of cirle (150 degree) to polar coordinates of pointImgView. </p>
  
  <p>Please give me some advices. Thanks so much</p>