This method is blowing my mind. I would have found the equation of the normal line through the point, find the intersection then used the distance formula. But that is clearly longer than Prime Newtons method.
If equation of a plane in 3D coordinates is ax + by + cz + d = 0, then I was wondering what would be the general equation of a straight line in a 3D coordinate! Can you give some hint? As always I have hit the like button the very moment you smile! 😀