TYPESCRIPT

check if point is in circle

sqrt((x - center_x) ** 2 + (y - center_y) ** 2) < r

Calculate the distance and check if it is in the radius

how to check if there is any point which lies inside the circle

public static bool IsWithinCircle(PointF pC, Point pP, Single fRadius){
        return Distance(pC, pP) <= fRadius;
    }

    public static Single Distance(PointF p1, PointF p2){
        Single dX = p1.X - p2.X;
        Single dY = p1.Y - p2.Y;
        Single multi = dX * dX + dY * dY;
        Single dist = (Single)Math.Round((Single)Math.Sqrt(multi), 3);

        return (Single)dist;
    }