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QUESTION
Prove a^ 2= b^ 2+ c^ 2- 2 bc cos( A )and c^ 2= a^ 2+ b^ 2- 2 ab cos( C )by drawing perpendiculars to the other sides.What is the least information...
- Prove a^2 = b^2 + c^2 - 2bc cos(A) and c^2 = a^2 + b^2 - 2ab cos(C) by drawing perpendiculars to the other sides.
2.What is the least information you need to know to use the cosine law:
a.To calculate an unknown side?
b.To calculate an unknown angle?
