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OCR C2 Trigonometry watch

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    (Original post by Josh_Dey)
    But aren't you clever 'I'm clever'?
    Yes. I'm only 7 you see.
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    (Original post by I'm clever)
    Well I learnt how to store my answer in the calculator in Statistics so I can apply this to C2, or any question that requires multiple stages of working in maths.
    By all means store down answer in the calculator (it is automatically stored, just use the ANS button) but you still need to write down intermediate steps in the exam in case you stuff up.
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    (Original post by Mr M)
    And the area of the triangle is \displaystyle\frac{1}{2}r^{2} \sin \theta
    FML
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    (Original post by Farhan.Hanif93)
    That's the formula for the area of sector OAB rather than the triangle OAB. You don't know what the area of the sector is so you can't deduce that step above.

    What I would do is use formula for the area of the triangle (A=\frac{1}{2}ab\sin C) to find that \frac{1}{2}5^2 \sin \theta = 8 and just solve for \sin \theta. Then recall that \sin \theta = \sin (\pi - \theta).
    I would do the above too...
 
 
 
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Updated: April 9, 2011

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