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 September 15th, 2016, 10:02 AM #1 Senior Member   Joined: Jan 2015 From: London Posts: 108 Thanks: 2 Trigonometry and Circle Properties https://images-1.discordapp.net/.eJw...bO7Gg4azXvZTZ4 I have done 3, a b and c but I can't do d. How do I get the angle of d? answers to a)87 b)53.1 c)90
 September 15th, 2016, 11:24 AM #2 Senior Member   Joined: Jan 2015 From: London Posts: 108 Thanks: 2 I missread c sorry i got that wrong ? can anyone help?
September 15th, 2016, 11:58 AM   #3
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 September 15th, 2016, 12:01 PM #4 Senior Member   Joined: Aug 2016 From: morocco Posts: 273 Thanks: 32 d) angle ADB=180- angle BDO =180- angle OBD since OD=OB. Last edited by abdallahhammam; September 15th, 2016 at 12:08 PM.
 September 15th, 2016, 12:07 PM #5 Senior Member   Joined: Jan 2015 From: London Posts: 108 Thanks: 2 so for 4a and b are both 9.91 but for c how would you find out the angle A ? don't you need another angle in order to do that?
 September 15th, 2016, 12:12 PM #6 Senior Member   Joined: Aug 2016 From: morocco Posts: 273 Thanks: 32 cos(OAB)=AB/OA=116/145.

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