Answer:

Explanation:
Given



Required
The coordinate of the fourth point (C)
The given coordinates indicate the rectangle is vertical/horizontal because it has similar x and y values.
The coordinate of such rectangle can be represented as:




By comparing the general coordinates with the given coordinates, we have:
 --- see A and B
 --- see A and B
 --- see A and C
 --- see A and C
 ---- see C and D
 ---- see C and D
 --- see B and D
 --- see B and D
So, we have:

