Question

a man walks 3 km north and then 4 km east find how far is he now from the starting position

Answer 1

Using Pythagoras theorem  $\sqrt{4^2+3^2}$ = 5 km

Answer 2

H =  P sq.  +B sq.

Therefore

19 + 16 = 25

Therefore he is 5 km far from his starting position.