Question

9. How many right angles do clock hands move if it starts from 12 and makes
(a) Complete revolution
(b) Twelve to three
(c) Half of a revolution
(d) 3/4th of a revolution​

Answer 1

a) 4 right angles to make a complete revolution

b) 1 right angle from 12 to 3

c) 3 right angles to make 3/4th of a revolution