Why do we need to use the SINE RULE, when we have learnt TOA CAH SOH?
TOA CAH SOH is use to solve what? And SINE RULE is use to solve what?
can anyone tell mi plz..
TOH CAH SOH is for use only in right angled triangles.
For non-right angled triangles we can find an unknown side (providing we have two angles and another side)
$\displaystyle
\frac{a}{sinA} = \frac{b}{sinB}= \frac{c}{sinC}
$
or if you are looking for an unknown angle (with two sides known and one angle then use
$\displaystyle
\frac{sinA}{a} = \frac{sinB}{b} = \frac{sinC}{c}
$