So , what are the coordinates of other endpoint of AB ?

Question

1. So , what are are the coordinates of the other endpoint of  AB 

Answer 1

If you have specific coordinates of the midpoint and one endpoint, you can substitute these into midpoint formula and solve for the coordinate of the missing endpoint (one formula for x coordinates, a similar formula for y coordinates).

 

Of course, we need to have that specific data, which you have not provided.