1. ## Circle theorems question

Can anyone please explain to me how to get the missing answers? Thanks.

2. ## Re: Circle theorems question

(just click on the pic to zoom in)

3. ## Re: Circle theorems question

I found out ABC, but I can't figure out OAD.

4. ## Re: Circle theorems question

value of angles
RCB =56
ABC=70.5
Triangle OAC is isosceles.Finish it after finding angleAOC

5. ## Re: Circle theorems question

How is ABC 70.5?

6. ## Re: Circle theorems question

Originally Posted by Ashir
How is ABC 70.5?
Its 1/2 of 141

7. ## 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.

8. ## 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

What arc?

10. ## Re: Circle theorems question

Still in need of an answer.

11. ## Re: Circle theorems question

angleOAD = 74 deg Ichanged your drawimg moving A closer to C making angle AOC acute