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# Circle theorem Tweet

Maths and statistics discussion, revision, exam and homework help.

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1. Circle theorem
How do i do this

2. Re: Circle theorem
i know that PAD = 18

ABD and ADB = 180-72/2 = 54
3. Re: Circle theorem
AP=AB

What does this tell you about the triangle APB?

And what does that imply about the angles in the triangle?
4. So, you know that the triangle is ********* which means the angles are the ****.
5. Re: Circle theorem
(Original post by notnek)
AP=AB

What does this tell you about the triangle APB?

And what does that imply about the angles in the triangle?
They have to bee the same
6. Re: Circle theorem
So, you know that the triangle is ********* which means the angles are the ****.
same
7. Re: Circle theorem
(Original post by zed963)
They have to bee the same
Well two of them are the same:

<APB = <ABP

Now you know the size of <PAB (90) so what are <APB and <ABP ?
8. Re: Circle theorem
(Original post by notnek)
Well two of them are the same:

<APB = <ABP

Now you know the size of <PAB (90) so what are <APB and <ABP ?
45
9. Re: Circle theorem
Its 117o, 90-72=18, APD=45 because the triangle is isololes. 18+45=63, 180-63=117.
Last edited by JoeFo; 04-06-2012 at 10:14.
10. Re: Circle theorem
(Original post by zed963)
45
Good. Finally, look at triangle APD.

<APD = 45, <PAD = 18

So what is <PDA ?
11. Re: Circle theorem
(Original post by notnek)
Good. Finally, look at triangle APD.

<APD = 45, <PAD = 18

So what is <PDA ?
117!!!!
12. Re: Circle theorem
(Original post by JoeFo)
117!!!!
Do you object to the OP solving this for themselves
13. Re: Circle theorem
(Original post by notnek)
Good. Finally, look at triangle APD.

<APD = 45, <PAD = 18

So what is <PDA ?
117
14. Re: Circle theorem
how would i do this then

part b
15. Re: Circle theorem
(Original post by zed963)
how would i do this then

part b
You really need to start thinking for yourself

Sketch the diagram

Mark any angles that you know

Indicate any equal lines/angles
16. Re: Circle theorem
(Original post by zed963)
how would i do this then

part b
117 is correct.

Have you made any progress with this question? What is <AOB?
17. Re: Circle theorem
(Original post by JoeFo)
117!!!!
You're like the annoying kid in a classroom who shouts out the answer before the teacher has finished going through a problem .
18. Re: Circle theorem
(Original post by notnek)
You're like the annoying kid in a classroom who shouts out the answer before the teacher has finished going through a problem .
Ahahaha +rep
19. Re: Circle theorem
(Original post by TenOfThem)
You really need to start thinking for yourself

Sketch the diagram

Mark any angles that you know

Indicate any equal lines/angles

20. Re: Circle theorem
(Original post by zed963)
Sorry, no.