The hour hand of clock revolves by 360 degree or 4 right angles in 1 complete round.
(a) The hour hand of a clock revolves by 90 degree of 1 right angle when it goes from 3 to 6. Hence one right angle
(b) The hour hand of a clock revolves by 180 degree of 2 right angles when it goes from 2 to 8. Hence two right-angles
(c) The hour hand of a clock revolves by 180 degree of 2 right angles when it goes from 5 to 11. Hence two right angles
(d) The hour hand of a clock revolves by 90 degree of 1 right angle when it goes from 10 to 1. Hence one right angle
(e) The hour hand of a clock revolves by 270 degree of 3 right angles when it goes from 12 to 6. Hence three right angles.
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