Mathematics 10 — Exercise Review · Q1 (vii)
Full question
Which is a correct cosine law?
| Option | Value |
|---|---|
| a | cosα=(b²+a²−c²)/(2ab) |
| b | cosβ=(c²+b²−a²)/(2cb) |
| c | cosγ=(a²+b²−c²)/(2ab) |
| d | cosγ=(ca²+b²−c²)/(2ab) |
Step-by-step solution
γ is opposite c and is included between a and b.
Answer
(c) cosγ=(a²+b²−c²)/(2ab)