MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 3
x2 = 64 + 100 - 33.266
X = 11.434 cm
EXAMPLE
Solve the triangle of figure 27, view 3 (on page 83), for angle A using the
Law of cosines.
SOLUTION
a2 = b2 + c2 - 2bc cos A
Given:
a=6
b=5
c=7
62 = 52 + 72 - (2 x 5 x 7 cos A)
36 = 25 + 49 - 70 cos A
36 = 74 - 70 cos A
Subtracting by -74:
Dividing 38 by 70:
cos A = 0.54286
By interpolation:
angle A = 57,, 7' 18"
89
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