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3) In trigonometry there are three systems for
the measurement of angles.
(I) Sexagesimal system : In this system
a right angle is divided and sub-divided into small parts as given
below.
 
(II) The Centisimal System : In this system
a right angle is divided and sub-divided as below :
1 rt. angle = 100 grades (i.e. 1000)
1 grade = 100 minutes (i.e. 100')
1 minute = 100 seconds (i.e. 100'')
Note : The minutes and seconds of both systems are distinct from
each other.
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