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# HELP Maths Questions!!

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1. These questions are so confusing anyone can guide me through them.

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2. question 1:

use pythagorous theorem to find length AD
use cosine rule to fine angle DBA
now you know angle BAC and ABC and ACB and a side (13cm) you can use sine rule
3. (Original post by NothingButWaleed)

These questions are so confusing anyone can guide me through them.

(Original post by ihatePE)
question 1:

use pythagorous theorem to find length AD
use cosine rule to fine angle DBA
now you know angle BAC and ABC and ACB and a side (13cm) you can use sine rule
Mate it's right angles, you can get by without the cosine rule.
4. (Original post by RDKGames)

Mate it's right angles, you can get by without the cosine rule.
you can but i'm a bit dumb dumb so i just said what method i thought of first
5. (Original post by RDKGames)

Mate it's right angles, you can get by without the cosine rule.
I still dont get how to do it, i literally dont get a thing!
6. (Original post by NothingButWaleed)
I still dont get how to do it, i literally dont get a thing!
Okay. Label angle as

We know that as CB is the hypoteneuse and 13 is the adjacent side to the angle theta.

Means that

How do we find theta? Use trigonometry inside the smaller triangle to find it.
7. (Original post by RDKGames)
Okay. Label angle as

We know that as CB is the hypoteneuse and 13 is the adjacent side to the angle theta.

Means that

How do we find theta? Use trigonometry inside the smaller triangle to find it.
what do you mean by label cba as 0?
8. (Original post by NothingButWaleed)
what do you mean by label cba as 0?
The angle made by the lines CB (DB works too) and BA. Label it and attempt to find what it is using the smaller triangle.
9. (Original post by NothingButWaleed)
what do you mean by label cba as 0?
If you don't understand what's being explained to you, then you don't properly understand the topic.

Watch all the videos in the trig section which involve triangles

http://www.examsolutions.net/maths-r...her/module.php

then revisit this question

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Updated: August 24, 2016
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