Law of Cosines, Example 6. In this Youtube video from patrickJMT, find how far a person is from a house by knowing that person's distance to someone else and the angle formed between them and the house.
Trigonometry - Oblique Triangles from MathBitsNotebook.com
A collection of lessons and practice examples with answers:
LESSONS Area of Triangle (formulas, derive formula, sine of an obtuse angle) Law of Sines (oblique, ASA, AAS, examples, deriving the formula) Law of Sines - Ambiguous Case (SSA, examples, summary, what to look for) Law of Cosines (SAS, SSS, facts to remember, deriving the formula, examples) Law of Cosines - Ambiguous Case (SSA, quadratic formula, examples, summary) Applications with Navigation and Vectors
Practice with Area of Triangles Using Trigonometry Practice Law of Sines Practice with Law of Cosines Practice with Navigation and Vectors