
Find from the tables the value of
(i) cos 37o (ii) cos 37o 42' (iii) cos 37o 45'![]()
cos 37o = 0.7896
Look horizontally along 37o column and vertically under 42o in 'B' group.
cos 37o 42' = 0.7912
(iii) cos 37o 45' As in (ii) read for cos 37o 42'
and for 3' read from 'C' group.
To find q when cosine ratio is known
If
, find q

The reading can be obtained from t-tables.
