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

1. (Original post by The Q maestro)
How you find area of an equilateral triangle

Base times height /2

And also 0.5ab sinc
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nah it's square root 3/4a^2 (a being length of equal sides)
nah it's square root 3/4a^2 (a being length of equal sides)
Why cant you just cut the triangle into half and then find the area of each right angle using b*h/2

You can find the surface area for the base easily, but how you find surface area for the three trianglular faces

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3. can someone send me the equations needed to know for optimisation please
4. I uderstand this but when calculation the area of the sector the equation is

A= ½ × r2 x (θ - sin θ) However when calculating it in the question they use ½ ×r2 x (sin θ)

I am confused on this.
5. How many decimal places must you give answers to? Or Significant figures?

And can you give answers in fractions
6. (Original post by MATTTT)
I uderstand this but when calculation the area of the sector the equation is

A= ½ × r2 x (θ - sin θ) However when calculating it in the question they use ½ ×r2 x (sin θ)

I am confused on this.
.5r^2 sin(theta) is probably the area of the triangle in a sector of a circle. Your Q may have referred like that.
7. (Original post by dripper)
How many decimal places must you give answers to? Or Significant figures?

And can you give answers in fractions
It will be specified in the question otherwise anything (including fractions) is accepted
8. (Original post by MATTTT)
I uderstand this but when calculation the area of the sector the equation is

A= ½ × r2 x (θ - sin θ) However when calculating it in the question they use ½ ×r2 x (sin θ)

I am confused on this.
The first equation is for the area of a segment

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9. My exam is in 1 hour and a half (C12) Wish mee luck ..

and good luck to everyone else..
10. Who else is taking 2 calculators into the C2 exam?
11. Can some one pleas explain this to mee
12. Paper leaked?
13. Someone please tells every formula I need to know
14. (Original post by FluffyCherry)
Can some one pleas explain this to mee
The last two bits? Try and draw right-angled triangles and you'll see it.

Btw, part c requires cosine rule so find the length of some lines in order to do so
15. (Original post by FluffyCherry)
Can some one pleas explain this to mee
I think the first part is C3 -implicit differentials? What paper is this from
The last two bits? Try and draw right-angled triangles and you'll see it.

Btw, part c requires cosine rule so find the length of some lines in order to do so
Nah you just can straightaway get the angle using the coordinates and arctan em.
17. (Original post by Hsakbo)
I think the first part is C3 -implicit differentials? What paper is this from
I actually have no idea, I found it in a maths group.
The last two bits? Try and draw right-angled triangles and you'll see it.

Btw, part c requires cosine rule so find the length of some lines in order to do so
Thaanx
19. Last minute Q can anyone tell me when a curve is in both the y+ve and y-ve like:

Would I have to worry if I'd get a nil area(0) when integrating the usual way?
20. (Original post by Kwaks)
Who else is taking 2 calculators into the C2 exam?
Lmao mee. One that can integrate and a normal one just in case.

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