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# C3 Trig and Circles watch

1. Question:
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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2. (Original post by TSRforum)
Question:
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= and that BC= are you not home and dry as you can work out the perimeter and area from them?

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