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tried cosine rule ?

im not sure how to do this at all....

do u knw cosine rule ?

i have just started learning about it

ok
\[\cos B=\dfrac{a^2+c^2-b^2}{2ac} \]

now solve for b

yea good cosine rule,,my answer is b=2.44 (approx.)

u could use sin law too i think

sorry 1.22

use my equation < means angle

actually my options are:
1.6m
4.5m
0.1m
5.7m
I thought it was 1.6m?

am I wrong?

actually it was 5.7 after I figured it out.. Thanks though

did u use my formula!

yea approx.

yes thank you

np :)