The 3rd Answer: The empty square has a side length of 10 and an area of 100 square units.
Step-by-step explanation:
The pythagorean theorem states that for any right triangle ith legs a and b and a hypotenuse of c that: therefore:
In the given right triangle if we apply this and see that meaning that the missing side must be 10. Because of this and the fact that the area of a square is then A=100 and it is obvious that: The empty square has a side length of 10 and an area of 100 square units.