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Find the radius of a circle inscribed within a sector?

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    Night before the exam and I'm still revising- I know, I'm terrible.

    Came across a question in the June 2011 C2 paper and I have no idea how I'm supposed to do it. The mark scheme didn't make any sense and all the solutions I found didn't give me the answer specified in the mark scheme when I tried them out.

    Click image for larger version. 

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    That's the question- part (b) is the one I don't understand. How on earth do I do that? (also, I was not aware anything like that was even on the syllabus)

    Many thanks!
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    (Original post by LanasTea)
    Night before the exam and I'm still revising- I know, I'm terrible.

    Came across a question in the June 2011 C2 paper and I have no idea how I'm supposed to do it. The mark scheme didn't make any sense and all the solutions I found didn't give me the answer specified in the mark scheme when I tried them out.

    Click image for larger version. 

Name:	q5.png 
Views:	353 
Size:	28.2 KB 
ID:	150788

    That's the question- part (b) is the one I don't understand. How on earth do I do that? (also, I was not aware anything like that was even on the syllabus)

    Many thanks!
    See this post, i have answered it here.
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    (Original post by raheem94)
    See this post, i have answered it here.
    Thank you
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    edit: dw

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Updated: May 23, 2012
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