I thought that maybe some of you may want to see how I did it so enjoy the source 
fixed the radius error 
public bool in_circle(int center_x, int center_y, int radius, int x, int y)
{
int dist = ((center_x - x) * (center_x - x)) + ((center_y - y) * (center_y - y));
if (dist < (radius * radius))
{
return true;
}
else if (dist > (radius * radius))
{
return false;
}
else
{
return false;
}
}
if (in_circle(18, 4409, 25, X, Y) == true)
{
RPC.iPrintln(-1, "You're in the radius!");
}

I thought that maybe some of you may want to see how I did it so enjoy the source 

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