Q.4 What part of a revolution have you turned through if you stand facing
(a) east and turn clockwise to face north?
(b) south and turn clockwise to face east?
(c) west and turn clockwise to face east?

(a) If we start from East and turn clockwise to face North, 3 /4 of a revolution is required.
(b) If we start from south and turn clockwise to face east, 3/4 of a revolution is required.
(c) If we start from west and turn clockwise to face east, 1/2 of a revolution is required.