# How to find the missing side of a non-rightangled triangle?

one sides 6cm and the other is 10cm

Posted Thu 17th May, 2012 @ 20:25 by aliceturner

Answered Thu 17th May, 2012 @ 20:38 by Hummi C

You must have been give angles or something else?
If you're given an angle you'll have to use the cosine formula

Answered Thu 17th May, 2012 @ 21:37 by Blue and Red

In this case you most definitely would've been given at least one angle in an exam question scenario... You would use the sine rule or cosine rule, as opposed to pythagoras' theorem.

Sine rule: a/sinA = b/sinB = c/sinC

Cosine rule: c^2 = a^2 + b^2 -(2ab x cosC)

Another useful rule to remember is that for the area of a triangle, which is:
1/2 x ab x sinC

All of these equations can be manipulated to find specific lengths, and the values a,b,c,A,B,C can all be interchanged as long as they're in a similar form to as above (if that makes sense?).

Answered Sat 19th May, 2012 @ 16:13 by sammiecaine

Noope i didnt even get an angle, thats why im so confused! x

Answered Sun 27th May, 2012 @ 18:36 by aliceturner