Starting from point A Tianna walks for 20 m till point C in north east direction before turning to her right. She walks 20 m again turning to her right stopping at point B. How far is point A from point B.

$20\sqrt{2}$m $10\sqrt{2}$m 20 m 10 m

$20\sqrt{2}$m

As , It is clearly seen that ACB is a right angeled triangle. By using pythagoras theorem, P² + B² = H² 20² + 20² = H² H = 20\(\sqrt {2 }\) m