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

1. (Original post by dominicwild)

Part d on this question confuses me. I've drawn a diagram, but can't get my head around how they got the angle ARQ. I drew a diagram from my understanding of the situation. Is there anything wrong with it?
You're diagram is incorrect so it's hard for you to understand, draw it again with some perspective with regards to the points P and Q as they do not lie on the same line like you have drawn

Think about perpendicular bisected of PR as the shortest distance then use Pythagoras, but you won't be able to do this without a diagram that is correct

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What topics are best to keep fresh in my mind for smaller non long winded questions?
Geometric sequences and trigonometrical identities are worth many marks but not too complictaed
3. (Original post by domcandrews)
You're diagram is incorrect so it's hard for you to understand, draw it again with some perspective with regards to the points P and Q as they do not lie on the same line like you have drawn

Think about perpendicular bisected of PR as the shortest distance then use Pythagoras, but you won't be able to do this without a diagram that is correct

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I don't understand how P and Q don't lie on the same line. As the question states that, a circle with center A, goes through points P and Q. Therefore they lie on the circle and PQ is the diameter. The center point, is the mid point of the two, so they line on the same line?
4. (Original post by dominicwild)
I don't understand how P and Q don't lie on the same line. As the question states that, a circle with center A, goes through points P and Q. Therefore they lie on the circle and PQ is the diameter. The center point, is the mid point of the two, so they line on the same line?
ok yeah they lie on the sameline, but its easier to picture it if you points in perspective i.e rather than how youve done it, maybe its just me i dunno
5. (Original post by domcandrews)
ok yeah they lie on the sameline, but its easier to picture it if you points in perspective i.e rather than how youve done it, maybe its just me i dunno
Well, I can't imagine any other way to draw it really.
6. Use the cosine rule to figure out the angle as you have all of the sides of a triangle. a^2 = b^2 + c^2 - 2bc cosA where A is your angle
7. (Original post by Lukemarks1997)
Use the cosine rule to figure out the angle as you have all of the sides of a triangle. a^2 = b^2 + c^2 - 2bc cosA where A is your angle
Actually I think in the mark scheme they used sine rule but both should work I think. Dunno
8. (Original post by dominicwild)

Part d on this question confuses me. I've drawn a diagram, but can't get my head around how they got the angle ARQ. I drew a diagram from my understanding of the situation. Is there anything wrong with it?
Consider the midpoint of PR to be M. If you find the angle of APM, it's the same as ARQ.

5 root 5 / 15 = Sin theta

Solve to find theta.

It is also worth noting, if you find the angle subtended at the centre, by the chord, you can avail of the cosine rule to solve it.
9. whos doing ial C12 im scared the paper is 2 hours and 30 minutes wish i did gce
10. Erm... #AllNighterClub
11. (Original post by motheryucker)
Erm... #AllNighterClub
-high five-
12. (Original post by Skygon)

I would like to know where to start
The ways is to draw a chord OB and OC and come to the conclusion that triangle Odc and OAB are equilateral and symmetric. Use the area of the sector and segment equations and minus the symmetric parts from the main semi.

Am I too late?
13. (Original post by motheryucker)
Erm... #AllNighterClub
#EarlyMorningClub
14. (Original post by motheryucker)
Erm... #AllNighterClub
Yes!
15. Volume and sa for prism
16. #AllNighterClub #RedBULL #C1>C2 ANYDAYOFTHEWEEK
17. vol area of cross section x length
sa total area of each face on prism
18. How you find area of an equilateral triangle

Base times height /2

And also 0.5ab sinc
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19. OHk guyz gud luck to all of you out there
Ace the exam!!!
20. Is the exam likely to be harder than last years ??? Omg feeling nervous now :-/

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