Question

Find the number of right angles turned through by the hour hand of a clock when it goes from

(a) 3 to 6 (b) 2 to 8 (c) 5 to 11

(d) 10 to 1 (e) 12 to 9 (f) 12 to 6

Answer 1

The hour hand of a clock revolves by 360º or 4 right angles in 1 complete round.

(a) The hour hand of a clock revolves by 90º or 1 right angle when it goes from 3 to 6.

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(b) The hour hand of a clock revolves by 180º or 2 right angles when it goes from 2 to 8.

(c) The hour hand of a clock revolves by 180º or 2 right angles when it goes from 5 to 11.

(d) The hour hand of a clock revolves by 90º or 1 right angle when it goes from 10 to 1.

(e) The hour hand of a clock revolves by 270º or 3 right angles when it goes from 12 to 9.

(f) The hour hand of a clock revolves by 180º or 2 right angles when it goes from 12 to 6.