MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 3
(2) Find the number of minutes in the extreme right-hand column, reading
from the bottom toward the top.
(3) Locate the proper column for the function, using the headings at the
(4) Find the value of the function in this column at a point directly
across from the given number of minutes.
Find the sine of 46,, 15'; that is, sine 46,, 15' = ?
For angles between 45,, and 90,,, the value of the sine is found in the column
marked "sine" at the bottom. The "minutes" column is followed up to 15',
and then in the "sine" column at a point across from 15', sin 46,, 15' =
Find the tangent of 45,, 48'; that is, tan 45,, 48' = ?
For angles between 45,, and 90,,, the value of the tangent is found in the
column marked "tangent" at the bottom . The "minute" column is followed up
to 48', and then in the "tangent" column at a point across from 48', tan 45,,
48' = 1.02832.
Angle Corresponding to a Given Function
In the preceding examples and problems, finding the value of the
trigonometric function of a given angle has been discussed.
It is also
necessary to understand the reverse of this procedure; that is, how to use
the tables of trigonometric functions to find the angle corresponding to a
given trigonometric function. The procedure is as follows:
Locate the given number (value of function) such as the sine of .69466
in the proper column,