20.jpg

Suppose we are at 12,

And we rotate right angle

21.jpg

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,

22.jpg

 

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

  1. Chapter 5 Class 6 Understanding Elementary Shapes
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.