public bool Intersect(Circle2D other)
{
var diff = other.GetCenter() - center;
return(diff.Length < radius + other.GetRadius());
}
public bool IntersectCircle(Circle2D circle)
{
return(IntersectCircle(circle.GetCenter(), circle.GetRadius()));
}
public bool Contains(Circle2D other)
{
var diff = other.GetCenter() - center;
return(diff.Length + other.radius < radius);
}