What fraction of a clockwise revolution does the hour hand of a clock turn through when it moves from 12 To 6, 6 To 9, and 1 To 10. Also, find the right angles in each turn.
Solution:
When an hour hand moves in a clockwise direction
(i) from 12 to 6
The hour hand moves through 180 degrees or $\frac{1}{2}$clockwise revolution or through 2 right angles.
(ii) from 6 to 9
The hour hand moves through 90 degrees or $\frac{1}{4}$ clockwise revolution or through 1 right angle.
(iii) from 1 to 10
The hour hand moves through 270 degrees or $\frac{3}{4}$ clockwise revolution or through 3 right angles.
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