MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 3
EXAMPLE
Given an acute angle and the opposite side in figure 19, find angle B and
sides "b" and "c."
SOLUTION
Here, side "b" is the adjacent side to angle A and "c" is the hypotenuse.
Angle B = 90,, - A = 74,, 5'.
According to rule (9)(see page 53), side
adjacent = side opposite x cotangent.
Substituting 1.7 inch for side
opposite and 3.5067 for cotangent, side adjacent = 1.7 x 3.5067 = 5.961
inch.
According to rule 11, hypotenuse = side opposite + sine.
Substituting 1.7 inch for side opposite and .2742 for sine, side opposite =
FIGURE 19.
FIND ANGLE B AND SIDES "B" AND "C."
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