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C3 Trig and Circles Watch

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    Question:Name:  image.jpg
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    Here is my w/o so far: http://imgur.com/a/cUOo0
    Any labelling I done wrong? I used cosine rule for the AB length and trig identities for AD

    Edit: Should be 90-X for angles OBC and OAD
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    (Original post by TSRforum)
    Question:Name:  image.jpg
Views: 41
Size:  486.3 KB
    Here is my w/o so far: http://imgur.com/a/cUOo0
    Any labelling I done wrong? I used cosine rule for the AB length and trig identities for AD

    Edit: Should be 90-X for angles OBC and OAD
    Your solution diagram is a bit too blurry for me to make it out in detail, but it looks to me as if you've over-done the labelling. If you observe that OC=r \cos \theta and that BC=r \sin \theta are you not home and dry as you can work out the perimeter and area from them?
 
 
 
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