Trigonometric Tables


   
 
Natural Sine Tables
An extract from the Natural Sine tables is given below:
 
 
 
Find from the tables the value of
 
(i) sin 56o (ii) sin 56o 24' (iii) sin 56o 28'.
 
 
(i) sin 56o
 
Find 56o on 'Natural Sines' tables in 'A' group. As there are no minutes, the value is read horizontally under the 0' column.
 
sin 56o = 0.8290
 
(ii) sin 56o 24'
 
Look horizontally along 56o column and vertically under 24' in 'B' group.
 
sin 56o 24' = 0.8329
 
(iii) sin 56o 28' As in (ii) read for sin 56o 24' and for 4' read from 'C' group.
 
sin 56o 24' = 0.8329
 
mean difference for 4' = 7 to be added
 
sin 56o 28' = 0.8336
 
 
 
As the angle has increased, sine ratio has increased.
 
To find q when sine ratio is known.
 
 
 
If sinq = 0.8336, find q.
 
\ q = 56o28'
 
 
The readings can be obtained from the tables.
 
 
     
   
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