Qualification > Math

IGCSE MATHS Doubts

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thenewkid™:

--- Quote from: 6394 on May 19, 2010, 05:12:08 am ---2 <Pie>r h is the formula for findin area of a hollow pipe!!!!
m i ryt
 ??? ???

--- End quote ---
its the formula 4 finding the volume of a solid cylinder

thenewkid™:

--- Quote ---its the formula 4 finding the volume of a solid cylinder
--- End quote ---
i mean 2 pi r^h

thenewkid™:
2 pi r h
sry

thenewkid™:

--- Quote ---my paper 4 is today as well! Sad just a few hours away
can anyone help me out with this question? i can't use trig to calculate this angle, probably just missing something really easy cuz of stress and lack of sleep: June 2005, Paper 4 question 2e

thanks a lotttt!
--- End quote ---
3 hrs left
make a straight line down C and u'll get 90 at the bottom then cont using trig

thenewkid™:

--- Quote ---also, do we have to know how to make scale drawings for our current syllabus? i've never practiced it before, ever...does anyone think that will come on the paper today?
--- End quote ---
there are chances but dont worry. just convert all the units to cm or mm or whatever then use the scale factor as a ratio eg;  1cm:20000000cm

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