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# Homework help for maths, because i suck at it! watch

1. Hi, i'm really struggling with this maths homework on trigonometry in 3D shapes..take a look at it a see if u get it, because i really don't!

http://www.havering-sfc.ac.uk/owa/We...rUDSi&attcnt=1

3. (Original post by notnek)
ok this should work ans thanks!
Attached Images
4. IB_Trigonometry_Homework_2.pdf (46.1 KB, 81 views)
5. Can you do any of it? I'll assume not and start at i(a).

X is vertically above O and CO is the radius of the circle so COX must be a right angle. Hence, XCO is a right-angled triangle and you can use pythagorus to find XO.

If you're still stuck, draw out the triangle XCO with hypotenuse=25cm and adjacent=7cm.

I can't help you with every part so you need to let me know which ones you need help with.
6. (Original post by notnek)
Can you do any of it? I'll assume not and start at i(a).

X is vertically above O and CO is the radius of the circle so COX must be a right angle. Hence, XCO is a right-angled triangle and you can use pythagorus to find XO.

If you're still stuck, draw out the triangle XCO with hypotenuse=25cm and adjacent=7cm.

I can't help you with every part so you need to let me know which ones you need help with.
Thanks yo for your help so far...i've managed to do all of part one, but if i've made mistakes i can ask the teacher for help.
Now i am on part ii) b onwards, thats where i am totally stuck..
7. (Original post by iffi)
Thanks yo for your help so far...i've managed to do all of part one, but if i've made mistakes i can ask the teacher for help.
Now i am on part ii) b onwards, thats where i am totally stuck..
You have all three side lengths of the triangle so you can find all the angles using the cosine rule. Have a go and post again if you need more help.
8. (Original post by notnek)
You have all three side lengths of the triangle so you can find all the angles using the cosine rule. Have a go and post again if you need more help.
ok so i used the cosine rule...i did:

CosA=10^2+10^2-11.3^2/2x10x10... and i keep getting -6184.5 on the calculator
i bet i've even used the wrong calculation...?!

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