Qualification > Math

IGCSE MATHS Doubts

<< < (166/240) > >>

Ghost Of Highbury:
https://studentforums.biz/index.php/topic,7273.msg206902.html#msg206902

saleemsamer:
O/N 06 p4 q5 b and c with explanation plz ???

Choc.Kits:
Hey guys. Im having trouble on a question. Its:

November 2009, Paper 4, Question 7 (c)(i) and (ii)

Thank you!

Ghost Of Highbury:

--- Quote from: Choc.Kits on May 17, 2010, 12:22:09 pm ---Hey guys. Im having trouble on a question. Its:

November 2009, Paper 4, Question 7 (c)(i) and (ii)

Thank you!

--- End quote ---

Radius = X
Height = y

Volume or W = 1/3 * x^2 * y * pi = (x^2ypi)/3

3 times --> Radius = 3x
Height = 3y

VOlume = 1/3 * pi * (3x)^2 * 3y = 9x^2y*pi

W = (x^2ypi)/3
Vol. =  9x^2y*pi

W * 27 = Vol.

27W
----------

cii) Radius = 2x

      Height = y

Vol. = 1/3 * pi * (2x)^2 * y = (4x^2ypi)/3

W = (x^2ypi)/3

W * 4 = Vol.

Therefore, 4W

PS : Volume of a cone = 1/3*pi*r^2*h

saleemsamer:

--- Quote from: saleemsamer on May 17, 2010, 12:19:25 pm ---O/N 06 p4 q5 b and c with explanation plz ???

--- End quote ---
any1?

Navigation

[0] Message Index

[#] Next page

[*] Previous page