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September 15th, 2016, 11:02 AM   #1
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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
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September 15th, 2016, 12:24 PM   #2
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I missread c sorry i got that wrong ? can anyone help?
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September 15th, 2016, 12:58 PM   #3
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September 15th, 2016, 01:01 PM   #4
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d)


angle ADB=180- angle BDO

=180- angle OBD
since OD=OB.

Last edited by abdallahhammam; September 15th, 2016 at 01:08 PM.
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September 15th, 2016, 01:07 PM   #5
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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?
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September 15th, 2016, 01:12 PM   #6
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cos(OAB)=AB/OA=116/145.
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