Explanation:
Pythagoras's rule:
becomes
If we say b = 10:
You only need to look at the left triangle
Which of the options follows Pythagoras's rule?
Let's try the options until we get the right one (in no particular order)
If we try: 3) x = 4 y =
...
If we try: 4) x = 16 y = 116...
If we try: 2) x = 16 y = 29...
If we try: 1) x = 4 y =
...