A triangle is circumscribed on the circle of centre O in such a way that sides AB = 12 cm, BQ = 7 cm and CQ = 5 cm. Calculate the lengtth (in cm) of side AC.
A man walks 10 kms towards east, then takes a right turn and walks 8 km and again takes a left and walks 6km. In which direction is the man with respect to his starting position?