Answer:
Step-by-step explanation:
E and F are horizontally aligned, so the slope of EF is 0 and its length is 16-10 = 6.
G and H are horizontally aligned, so the slope of GH is 0 and its length is 16-10 = 6.
F and G are vertically aligned, so FG is vertical and its length is 10-4 = 6.
E and HG are vertically aligned, so EH is vertical and its length is 10-4 = 6.
Quadrilateral EFGH is a square.
