GetShapeIndiciesIntersectingCircle - How to set the radius in meters

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Hi guys.
I need to get all shape indicies from a point with X meters of radius.
I*#39;m using this, but it*#39;s not a precise result:

double radius = Math.Sqrt((pt1.X - pt2.X) * (pt1.X - pt2.X) + (pt1.Y - pt2.Y) * (pt1.Y - pt2.Y)) / 100;
List ind ...			

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