Help me Fast PLEASE!!!

in the triangle abc, ab=12 cm, angle bac=60 degree and angle acb=45degree. Find the exact length of bc PLEASE DOO IT FAST

Reply 1

MissBrown

Original post by Muktak

in the triangle abc, ab=12 cm, angle bac=60 degree and angle acb=45degree. Find the exact length of bc PLEASE DOO IT FAST

Unless you are in a different time zone your homework shouldnt need to be done until about 9am tomorrow right?

Why not draw it and see if you need
(i) The sine rule
(ii) The cosine rule
(iii) A bib whilst people spoon feed you

Im hoping it will be one of the first 2 and you will be able to help us help you by showing us what you have done so far. PLEASE DOO IT FAST

Reply 2

DonBorat

draw it out, label, see what you need, apply the trig rules

Reply 3

Artemis 97

Like Miss Brown says, we're not here to do your work for you but to help you do it at bits where you get stuck.

Draw the triangle, label corners A, B and C, and label any angles and sides that you know. You should also be able to work out angle abc fairly easily from what you have already been given.

Then look at what you need to find and what you already have, and think about the trigonometry rules you know. it could be the sine rule;
a/sinA = b/sinB = c/sinC
or the cosine rule;
a^2 = b^2 + c^2 - 2bc*cosA

Once you have decided which you need, put in the numbers you know to find the value you need.