The following question has three phases.Phase $1$:Write a class representing a $2$D point.Have the class consist of two fields representing it's coordinate, ideally x and y$.$Let the fields $($data members$)$ be public, but make sure that they don't fall victims to immutability so set the fields to be constant.Write a method $($function members$)$ that finds the distance from one point to the other.Write a method that finds the slope given another point.Phase $2$Using only instances of the point class, write a class representing a circle object.Let the fields be public, but make sure that they don't fall victims to immutability so set the fields to be constant.Provide an area and a perimeter method $($function member$).$Phase $3$:Using only instances of the of circle class write a sphere class.Let the fields $($data members$)$ be public, but make sure that they don't fall victims to immutability so set the fields to be constant.Provide a volume and surface area method $($function member$).$

Answer in C$++$ please