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# Urgent watch

1. How do you find the angle AOB
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2. I dont do maths anymore, but wouldnt A and B be the same? so use Trigonometry or Pythagoras to work out A/B, then minus those two added from either 360 or 180? (cant remember what angles in triangle add up to)
3. The way I would do it would be to split it into two right angled triangles, then use trig.
4. theres plenty of ways to do it.

tell us what you've actually done so far
5. OA and OB r radii of the circle. so OA=OB=4cm. As da 2 sides r known, da cosine rule can b used.
6. (Original post by Mufthaz)
OA and OB r radii of the circle. so OA=OB=4cm. As da 2 sides r known, da cosine rule can b used.

Yeah, thanks, it seems so easy, i think i had done a few too many excersises, because i was doing these in lessons fine Thank you for pointing out my mistake, and i'm sure i will not make the same mistake again.

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Updated: January 24, 2010
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