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Suppose we are at 12,

And we rotate right angle

Right angle turns in a clock - Part 2

So, we will be at 3

  Since right angle makes 1/4 th of the complete rotation.

  Hours rotated in right angle = 12/4

= 3

 

If we go from 3 to 9,

Right angle turns in a clock - Part 3

 

We have turned 1/2 revolution

i.e. 2 × 1/4 revolution

i.e. 2 right angles

 

So, in a clock

12 hours = 1 revolution

1 hour = 1/12 revolution

3 hours = 3/12 = 1/4 revolution

6 hours = 6/12 = 1/2 revolution

 

So,

  Full revolution  = 12 hours

  Right angle = 3 hours

  Straight angle = 6 hours

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.