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# Help with this A2 maths question watch

1. I'm having a lot of difficulties solving question 6(i) of this exam. The mark scheme is no help at all... I don't even know whether I'm going in the right direction or not. Can anyone please give me a hand?

This is the exam:
This is the mark scheme:

And this is my working:

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2. (Original post by t.s.r.)
I'm having a lot of difficulties solving question 6(i) of this exam. The mark scheme is no help at all... I don't even know whether I'm going in the right direction or not. Can anyone please give me a hand?

This is the exam:
This is the mark scheme:

And this is my working:

A is the centre for the arc BC so AB=AC=r Does that help ?
3. (Original post by brianeverit)
A is the centre for the arc BC so AB=AC=r Does that help ?
Let AB=AC=R then
Can you finish it from here ?
4. (Original post by brianeverit)
Let AB=AC=R then
Can you finish it from here ?
But why is R=2rcos x? Which formula are you using
5. (Original post by t.s.r.)
But why is R=2rcos x? Which formula are you using
AB is a chord of a circle. How do you find the length of a chord ?
6. (Original post by Ali97)
Questions?
No, got it. Thank you very much =)

(Original post by brianeverit)
AB is a chord of a circle. How do you find the length of a chord ?
Oh, okay! Thanks, I got it xD

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