how to find the radius using the center point only...
the only given point is the center point...
how to get or calculate for the radius...

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Do you mean the radius of a circle? You can't get a radius from just its center point; that's not enough information. Or are you talking about something else?

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Do you mean the radius of a circle? You can't get a radius from just its center point; that's not enough information. Or are you talking about something else?

If you have the centre point of a rendered circle you can find the radius by scanning pixels either horizontally or vertically until you find an edge, providing the circle is filled with a uniform colour and you can detect the edge by examining the pixels. I had to write something similar for someone to auto crop a few thousand New Yorker cartoons. The cartoons were all black and white and bounded by a rectangle surrounded by whitespace.

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