title: How to draw a straight line in arc which connects the center with circumference
body: <p>I have a custom view where I draw an arc.
  Now I also need to draw a line which joins the center and the circumference
  and should be exactly in the middle of arc. </p>
  
  <p>Now I know that the code for drawing line in android canvas is fairly simple</p>
  
  <p>but it does not involve angle and the arc is always using angle to draw itself.</p>
  
  <p>So I can I draw the line in the same direction as the arc?</p>
  
  <p>Am I clear here or do I need to explain more ?</p>
  
  <p>Please help.</p>