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# Circle Theorems Question Help

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1. http://prntscr.com/ave7zl

need help with this can someone explain how to do this. Thanks
2. (Original post by junayd1998)
http://prntscr.com/ave7zl

need help with this can someone explain how to do this. Thanks
What can you say about osr and ors
3. (Original post by samb1234)
What can you say about osr and ors
You could say OSR is 90-X
4. remember that the angles in a triangle always add up to a certain number....
5. (Original post by junayd1998)
You could say OSR is 90-X
Indeed, and what about ors (what can you say about the distances OR and OS?)
6. (Original post by samb1234)
Indeed, and what about ors (what can you say about the distances OR and OS?)
That it is an isoslies triangle because they are equal length OR and OS???
7. (Original post by junayd1998)
That it is an isoslies triangle because they are equal length OR and OS???
Yes
8. (Original post by junayd1998)
That it is an isoslies triangle because they are equal length OR and OS???
Yes.
9. (Original post by Zacken)
Yes.
So if we know OR and OS are equal and ROS is 2X Then 180-2x then divide by 2?
Im not sure tbh
10. (Original post by junayd1998)
So if we know OR and OS are equal and ROS is 2X Then 180-2x then divide by 2?
Im not sure tbh
What? You know that the triangle is isoceles, so ORS and SRO are both 90-x. And you also know that angles in a triangle add up to 180.

So ROS + 90 - x + 90 - x = 180. What's ROS, then?
11. (Original post by Zacken)
What? You know that the triangle is isoceles, so ORS and SRO are both 90-x. And you also know that angles in a triangle add up to 180.

So ROS + 90 - x + 90 - x = 180. What's ROS, then?
I am nearly there. Give me 10
Minutes
12. (Original post by Zacken)
What? You know that the triangle is isoceles, so ORS and SRO are both 90-x. And you also know that angles in a triangle add up to 180.

So ROS + 90 - x + 90 - x = 180. What's ROS, then?
2x.
13. (Original post by junayd1998)
2x.
Ta-da.

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