Question

Find the number of right angles turned through by the hour hand of a clock when it goes from
(i) 3 to 9
(ii) 4 to 7
(iii) 7 to 10

Answer 1

(i) When the hour hand goes from 3 to 9 clockwise, it will rotate by 2 right angles or ${180}^{\circ }$.




(ii) When the hour hand goes from 4 to 7 clockwise, it will rotate by 1 right angle or ${90}^{\circ }$.





(iii) When the hour hand goes from 7 to 10 clockwise, it will rotate by 1 right angle or ${90}^{\circ }$.