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I wanna draw circle between two points.Although I can draw a circle between two points ,I can not find the radius properly using pythagorean theorem.How can I find the radius of this circle? Thanks for your answer.

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Sefa
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    Not sure to understand your question: assuming that you can draw a circle between 2 points (as you write), how is it possible that you do not already have the corresponding radius? - Your question was maybe something else ? – JBA Feb 14 '15 at 14:22
  • I will choose two points and I will take latitute and longitude of them and I will find the center of these two points and I will draw a cicle which have the center I said before and this circle will have these two points.Sorry about bad English.Am I clear now ? – Sefa Feb 14 '15 at 14:44
  • Ok that's to say you want the distance between the center coordinates and one of the two points to get the radius ? If so you might want to apply this kind of maths as described below, would it fit ? [this so answer] (http://stackoverflow.com/a/365853/1720332) – JBA Feb 14 '15 at 14:50

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This is basic math. Coordinates are ( x1, y1 ) and ( x2, y2 ).

Midpoint is: xm = ( x1 + x2 ) / 2 and ym = ( y1 + y2 ) / 2

Distance is: dist = sqrt( ( x2 - x1 ) ^ 2 + ( y2 - y1 ) ^ 2 ) (sqrt means square-root)

Radius is: r = dist / 2

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