# 2017 OCR C1 official thread - 17th May

This poll is closed

### How did you find this exam?

Amazing! :woo: 12%
Good :H 24%
OKAY. :bebored: 32%
HORRIBLE PAPER!! :@18%
Hey everyone, I'm new here, but the website looks really helpful. I haven't seen an official thread for next week's C1, so I thought I'd start one...

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Original post by abcd56
Hey everyone, I'm new here, but the website looks really helpful. I haven't seen an official thread for next week's C1, so I thought I'd start one...

Have you done question 9ii on the June 2011 paper (http://www.ocr.org.uk/Images/62239-question-paper-unit-4721-core-mathematics-1.pdf)? I have no idea how to do it, even after drawing a diagram.
(edited 7 years ago)
Original post by alde123
Have you done question 9ii on the June 2011 paper (http://www.ocr.org.uk/Images/62239-question-paper-unit-4721-core-mathematics-1.pdf)? I have no idea how to do it, even after drawing a diagram.

That looks really weird. I have no idea, sorry. Does anyone else have any thoughts? Maybe you have to use a circle theorem, but I don't know which one.
(edited 7 years ago)
Original post by alde123
Have you done question 9ii on the June 2011 paper (http://www.ocr.org.uk/Images/62239-question-paper-unit-4721-core-mathematics-1.pdf)? I have no idea how to do it, even after drawing a diagram.

One of your circle theorems from GCSE.
Original post by RDKGames
One of your circle theorems from GCSE.

How do you know the points make a semi-circle?
(edited 7 years ago)
Original post by alde123
How do you know the points make a semi-circle?

If a right-angled triangle is inscribed within a circle, then the hypotenuse of the triangle goes through the centre... so you get a semicircle with the triangle inscribed inside it...

https://en.wikipedia.org/wiki/Thales%27_theorem
Original post by RDKGames
If a right-angled triangle is inscribed within a circle, then the hypotenuse of the triangle goes through the centre... so you get a semicircle with the triangle inscribed inside it...

https://en.wikipedia.org/wiki/Thales%27_theorem

So as long as there is a triangle with a right angle in the circle, then the two vertices without the right angle make the diameter?
Original post by alde123
So as long as there is a triangle with a right angle in the circle, then the two vertices without the right angle make the diameter?

Yes.
Everyone shisha's going to come up on b1 (core biology) spread the word!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Original post by RDKGames
Yes.

Ok thanks. Do you know how many circle theorems we need to know for Core 1?
Original post by alde123
Ok thanks. Do you know how many circle theorems we need to know for Core 1?

I don't, but they should be common knowledge at this level.
Original post by sahil_01
Everyone shisha's going to come up on b1 (core biology) spread the word!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

What?
Aqa b1 core biology
Shisha's hookah
Resitting it this year after getting a C, it's so easy but the newer exams are not tough compared to 2nd year but throw a lot of curve balls let's say so make sure you really know your stuff and focus on later papers & Solomon papers on physics and maths tutor.
Original post by Chichaldo
Resitting it this year after getting a C, it's so easy but the newer exams are not tough compared to 2nd year but throw a lot of curve balls let's say so make sure you really know your stuff and focus on later papers & Solomon papers on physics and maths tutor.

You should also try the delphis papers
Original post by alde123
You should also try the delphis papers

Are they harder?
Does anyone have any idea where I could get hold of a specimen paper for the C1 exam? Would be really helpful as I've done all the papers for OCR :/
Original post by emilyjean113
Does anyone have any idea where I could get hold of a specimen paper for the C1 exam? Would be really helpful as I've done all the papers for OCR :/

Done the Solomon ones?
http://www.physicsandmathstutor.com/a-level-maths-papers/c1-solomon/

Nopeeee! Thank you so much!