DIFF between TOA CAH SOH and the RULES!!?? HELP!!!

**xiaoz** · January 30th 2006, 11:44 PM

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..

**TD!** · January 31st 2006, 01:06 AM

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

**xiaoz** · January 31st 2006, 02:56 AM

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

**jacs** · January 31st 2006, 03:29 AM

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)

$<br /> \frac{a}{sinA} = \frac{b}{sinB}= \frac{c}{sinC}<br />$

or if you are looking for an unknown angle (with two sides known and one angle then use

$<br /> \frac{sinA}{a} = \frac{sinB}{b} = \frac{sinC}{c}<br />$

**xiaoz** · January 31st 2006, 04:36 AM

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

the poly ppl should no rite?

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