nov 2008 (paper 1 mathematics Q9 ii)

[haris]

can anyone plz tell me how to solve it thanks

 

[SZ11]

find volume when y=2 is rotated through 360 degrees with limits of 0 and 1
then subtract the volume obtained when the curve is rotated through 360 with limits of 0 and 1.
that will give you volume of the shaded region.

 

[haris]

thx m8 ill try

 

[SZ11]

answer should be 1.5pi... i think

 

[haris]

m8 yup 1.5pi is right ........m8 i just saw the marking scheme and there volume of cylinder is calculated ( with radius=2 and height=1)can u tell me why thanks