# Math Help - DIFF between TOA CAH SOH and the RULES!!?? HELP!!!

1. ## DIFF between TOA CAH SOH and the RULES!!?? HELP!!!

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..

2. TOA CAH SOH only holds in a right triangle, the sine (and cosine) rule are valid in an arbitrary triangle.

3. THXz.. but i still abit dun get it.. =.="

4. 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)

$
\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

$
\frac{sinA}{a} = \frac{sinB}{b} = \frac{sinC}{c}
$

5. ... then i more confuse le.. cos i am the 1 asking~~ =.=

the poly ppl should no rite?