can anyone help me make a circle shape with trendline as radius

 
I've been doing research on the forex charts and I have come to a conclusion that the trendline forms the equation of a circle I need help in developing a circle shape with one end of the trendline as centre of a circle and the other end forms a radius. It would really simplify my analysis greatly... I am not familiar with the programming languages... If someone could develop this for me I would deeply appreciate it.
 
thanks
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