MHB Math Struggles: My Little Bro's Story

[kingsala]

hi guys my little bro came to me with this as he's doing a maths course like me but he wanted me to help but could with some but not this bit hahah

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[MarkFL]

Re: spot the issue

I have moved this thread here to our Trigonometry subforum, as it is a better fit for the questions.

 

[Evgeny.Makarov]

Re: spot the issue

For (i), the law of sines says that
\[
\frac{AB}{\sin48}=\frac{BC}{\sin40}=\frac{23}{\sin40}
\]
For (ii), $AD=AB\cos40$.