Question 1167456
The distance from x1 to the midpoint is the same as the distance from the midpoint to x2. The distance is 3.5 to the midpoint, and 2.5+3.5=6. That is the x-coordinate.
The y distance is 5.5 to the midpoint, and 4.5+5.5 is 10

the values are (6, 10) for the other endpoint.