EXAMPLE

Solve the triangle in figure 27, view C (on page 83), for angle B using the

Law of sines.

To find angle B interpolate as follows:

From this the desired angle is

of the way from 74,, 35' to 74,, 36';

Therefore, angle B is:

74,, 36' 53"

13.

Law of Cosines

a.

(1) From figure 27, view A, triangle 1, AD = c - DB.

AD must be squared

for use in this equation.

b2 = AD2 + h2