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Edexcel C4 Revision Thread (28/06 14:00)

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Reply 180

Featherflare

I'm off to school. Good Luck everyone!

Reply 181

TheWolf

volume of a cone = 1/3 pi r^2 h

volume of sphere = 4/3 pi r^3

what else do we need to know?

surface areas

What are they then?

urmm.. i think if you differentiate the volumes you get the surface areas, im not 100%, i should be really given that the exams are 2day

Reply 185

nas7232

Gregball_87

urmm.. i think if you differentiate the volumes you get the surface areas, im not 100%, i should be really given that the exams are 2day

yeah that's right, differentiate volumes with respect to distance x you'll get the surface areas.

Reply 186

Zuber

nas7232

yeah that's right, differentiate volumes with respect to distance x you'll get the surface areas.

is that a given rule?? i dont think so.
take a cube for instance.
volume = x³ (x=side)
dV/dx = 3x²

however surface area is 6x²

Reply 187

Gaz031

It's not a rule it's just a weird coincidence in some cases. It's good to look for hidden connections but don't generalise too quickly.

Reply 188

Zuber

okay i just checked. surface area for cones and sphere's are given in the formula book under C1. there are:

sphere - 4(pi)(r²)
area of curved surface of cone - (pi)(r)(h)

Wikedo =)

Ok, time for me to go. Good luck everyone! :cool:

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Edexcel C4 Revision Thread (28/06 14:00)

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