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

1. (Original post by particlestudent)
There's only one thing I need to do for tomorrow now and that is to memorise all the area and volume formulas for the weird shapes.
I have learnt all the log rules and trig identities so all I have to do is as many questions as possible so that I do not screw up like I did in the physics...
2. Radian measure messes me up big time ):

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3. (Original post by Tiva4Eva)
I have learnt all the log rules and trig identities so all I have to do is as many questions as possible so that I do not screw up like I did in the physics...
The log rules like adding subtracting and squaring are easy, it's changing the base that is tricky. But I realised yesterday it is on the formula sheet
4. What proofs do we need to know?
5. (Original post by particlestudent)
What proofs do we need to know?
Just geometric

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6. (Original post by Ahsen2015)
WOW that's impressive
what did you get in them?

i sorted it now
majority i got above 60, half my mistakes were just dumb
they are just more long winded
not too bad, but then again im retaking so yh xD
7. (Original post by particlestudent)
The log rules like adding subtracting and squaring are easy, it's changing the base that is tricky. But I realised yesterday it is on the formula sheet
I realised that on Saturday and spent about 10 minutes smiling because I did not have to learn it... But yeah the log rules are easy. I just sometimes mess up the application
8. Guys
You have to learn the geometric formula proofs
two of them
1) the sum
2) the infinity

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9. (Original post by pearl_rose)
Still struggling with volume questions.. its not that I don't understand It, it's just that I never know which formulae's to use :[[[
Can anyone help me get around this?
You don't know which formula to use for the volume of a cuboid, a cylinder or a prism?

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10. (Original post by Bloom77)
Guys
You have to learn the geometric formula proofs
two of them
1) the sum
2) the infinity

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The infinity? Are you sure? It's not in the textbook

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11. (Original post by Tiva4Eva)
I have learnt all the log rules and trig identities so all I have to do is as many questions as possible so that I do not screw up like I did in the physics...
(Original post by nishofficial)
Radian measure messes me up big time ):

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(Original post by particlestudent)
The log rules like adding subtracting and squaring are easy, it's changing the base that is tricky. But I realised yesterday it is on the formula sheet
(Original post by Tplox)
majority i got above 60, half my mistakes were just dumb
they are just more long winded
not too bad, but then again im retaking so yh xD
(Original post by Bloom77)
Guys
You have to learn the geometric formula proofs
two of them
1) the sum
2) the infinity

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Does anyone know how to solve these
Attached Images

12. (Original post by Tplox)
majority i got above 60, half my mistakes were just dumb
they are just more long winded
not too bad, but then again im retaking so yh xD
you done all the other past papers?
13. (Original post by FluffyCherry)
Does anyone know how to solve these
what paper is that???
14. predictions for the last question?
15. (Original post by gdunne42)
You don't know which formula to use for the volume of a cuboid, a cylinder or a prism?

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Well for starters I don't have them memorized. every question I try and do has a different shape so I don't know which formula to use.. Is it always either volume of a cuboid, cylinder or prism that will come up? If so can you tell me the formulaes of them? And also I get a bit stuck on area aswell.. is it always just adding all the surface areas to get the total area, or area of cross section x length.. ugh I just don't know
16. (Original post by Ahsen2015)
what paper is that???
One of them is an international paper C12 (C1 and C2 combined), the other one is from the solomon paper C2, paper H
17. The 4 that you can't really work out in the exam and are GCSE are:

pyramid

V= 1/3 x base area x height
S.a. = area of base + area of other sides

Cone

V= 1/3πr^2h
Curved s.a = πr x l (slant height)

Cylinder

V= πr^2h
S.a. = 2πr^2 + 2πrh

Sphere

V= 4/3 πr^3
S.a. = 4πr^2

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18. (Original post by GCSE_2014)
predictions for the last question?
Its nearly always differentiation with shapes

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19. how do you do question 8 ii) on the june 2014 R paper?
https://qualifications.pearson.com/c...-June-2014.pdf
20. (Original post by nishofficial)
The infinity? Are you sure? It's not in the textbook

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Ooh
I know how to do it
But if it isn't on the textbook or in the specification, then it's fine

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