# Circle theorems question

• Sep 25th 2012, 12:04 PM
Ashir
Circle theorems question
Attachment 24926
Can anyone please explain to me how to get the missing answers? Thanks.
• Sep 25th 2012, 12:05 PM
Ashir
Re: Circle theorems question
(just click on the pic to zoom in)
• Sep 25th 2012, 12:27 PM
Ashir
Re: Circle theorems question
I found out ABC, but I can't figure out OAD.
• Sep 25th 2012, 01:10 PM
bjhopper
Re: Circle theorems question
value of angles
RCB =56
ABC=70.5
Triangle OAC is isosceles.Finish it after finding angleAOC
• Sep 25th 2012, 01:21 PM
Ashir
Re: Circle theorems question
How is ABC 70.5?
• Sep 25th 2012, 01:47 PM
bjhopper
Re: Circle theorems question
Quote:

Originally Posted by Ashir
How is ABC 70.5?

Its 1/2 of 141
• Sep 26th 2012, 07:27 AM
Ashir
Re: Circle theorems question
And? Opposite angles add up to 180 is the theory. Therefor ABC is 39. Why would it be one half of 141?
And I checked, my answers were right.
• Sep 26th 2012, 11:44 AM
bjhopper
Re: Circle theorems question
if angle ADC =141 arc ADC =78,angle AOC =78 not obtuse as you show. I assumed that arc ADC =141
• Sep 26th 2012, 11:51 AM
Ashir
Re: Circle theorems question
What arc?
• Sep 27th 2012, 09:23 AM
Ashir
Re: Circle theorems question
Still in need of an answer.
• Sep 27th 2012, 06:08 PM
bjhopper
Re: Circle theorems question
angleOAD = 74 deg Ichanged your drawimg moving A closer to C making angle AOC acute