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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by ToLiveInADream)
Guys, should I do the rest of the Solomon papers I haven't done or do the R/IAL c2 papers? Which is harder?
Do the R/IAL

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2. (Original post by tw15st3d)
if we have a CAST question in radians, is it alright to give answers as decimals instead of in terms of pi? i know it isn't necessarily as accurate but do you still get the marks?
It's fine to do it in decimals, often the answer won't be able to be written easily in terms of pi. If the answer is a precise part of pi though, then write it in terms of pi
3. (Original post by FluffyCherry)
These are the shapes that we should know.
Thank you, however I can't open that post for some reason... can you email it to me if I PM you my email?
4. (Original post by pearl_rose)
Thank you, however I can't open that post for some reason... can you email it to me if I PM you my email?
Okay
5. (Original post by Ahsen2015)
you done all the other past papers?
pretty much
im just going through the gold c2 past papers and the international papers really
looking at last year international, seems like they are making c2 harder :s
6. (Original post by physicsmaths)
Do the R/IAL

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Cool. I'll just finish off the solomon I'm doing atm ^.^
7. Does anyone know how you find chord length?
8. (Original post by Olon)
Does anyone know how you find chord length?
Depends. Usually you construct a right-angled triangle and do Pythagoras from there.
9. (Original post by physicsmaths)
Do the R/IAL

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Solomon papers are harder, but if you haven't done the R papers do them
10. (Original post by Olon)
Does anyone know how you find chord length?
Get the two coordinates of the chord
use this
d^2= (x2-x1)^2 + (y2-y1)^2
where d is the length
11. (Original post by ToLiveInADream)
Depends. Usually you construct a right-angled triangle and do Pythagoras from there.
can you give me an example please?
12. (Original post by frozo123)
Get the two coordinates of the chord
use this
d^2= (x2-x1)^2 + (y2-y1)^2
where d is the length
so can i use this everytime? instead of constructing a right angle and using pythagoras?
is it square rooted btw?
13. (Original post by Olon)
can you give me an example please?
Yeah, sure. There's loads of odd questions they do them in. Try: https://a44694f152ee562e38a9454969d2...%20Edexcel.pdf question 9c.

Draw a CLEAR and labelled diagram or it may get confusing.
14. (Original post by frozo123)
Get the two coordinates of the chord
use this
d^2= (x2-x1)^2 + (y2-y1)^2
where d is the length
What about if you don't have the coordinate points? Eg. the question I gave the other poster above.
15. (Original post by joe1545)
Solomon papers are harder, but if you haven't done the R papers do them
Yes but realistically if you get a really hard question then it will be ones very similar to the R papers. Since its the day before much better to do the R IAL papers. IAL can get particularly nasty.

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16. (Original post by ToLiveInADream)
Yeah, sure. There's loads of odd questions they do them in. Try: https://a44694f152ee562e38a9454969d2...%20Edexcel.pdf question 9c.

Draw a CLEAR and labelled diagram or it may get confusing.
Ah, thanks. Is this essentially the same as using the formula the other poster wrote?
17. Guys how do you work out B? Can you explain it step by step? Thanks
18. (Original post by Olon)
Does anyone know how you find chord length?

If you have the co-ordinates of the points where it touches the triangle, just use Pythagoras to find the length of the chord.
19. (Original post by ToLiveInADream)
What about if you don't have the coordinate points? Eg. the question I gave the other poster above.
are you trying to test me or are you stuck on it lol
20. (Original post by Olon)
Ah, thanks. Is this essentially the same as using the formula the other poster wrote?
I suppose you potentially could do it that way, but it would be extremely long (pages of working out + time) to get the coordinates in the first place. You would have to use parallel gradient, work out the line, work out where they intersect the triangle etc etc..

Using pythagoras makes more sense to me, but if you really can't see where the triangle to construct would be, do it.

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