Figure 4-22. Solving for unknown angles (tangent law)
Solution: Find the value of angles A and C by subtracting angle B from 180.
(C = A) = 180€-41 17' 32"= 138 42' 28"
Then substitute the known values in the tangent equation.
Now find the values of the unknown angles from the equations which follow:
The above solution is by natural functions.
4-13. Case IV - Three Sides. When three sides of a triangle are known, it is best to solve for the
remaining parts by the method of half tangents.