Maths, Addmaths and Statistics: Post your doubts here!

[namraahmad]

The marks say it all don't they ?
its a long question ..

Cylinder Part.
you will first take the surface area of the cylinder .. 2πr(h+r) then subtract πr^2 from it (cuz one end of cylinder is not there, as its an open cylinder) Now divide it by two because the cylinder is half filled.

Hemisphere part.

Find hemisphere's surface area with the formulae 2πr^2 .. (cuz the hemisphere is open ended too..) divide it by two (half filled.)

Add them both .. and you got yourself an answer.

thanks alotit was v helpful....... mere past papers me galat solve huawa tha so i got cnfused.........
thanks allllloooooottttttttt

 

[HarisLatif]

HarisLatif got it?

YEAH! i was actually doing a mistake in the median thing! but now got it thankyou

 

[Mayedah]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_11.pdf
Question 24 last part !

 

[HarisLatif]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_11.pdf
Question 24 last part !

equate AR= T(AQ) since these points lie on same line i used T as a constant. then solve it out by comparing the coefficients of p and q. you first need to get the value of ur constant and then substitute that and you'll get k.

 

[Mayedah]

equate AR= T(AQ) since these points lie on same line i used T as a constant. then solve it out by comparing the coefficients of p and q. you first need to get the value of ur constant and then substitute that and you'll get k.

Can u explain me step by step after u write the equation ! Thnx

 

[asd]

Can u explain me step by step after u write the equation ! Thnx

AQ = (2p + 5q)/6
AR = (2p + kq)/2
Note that they are collinear, so their scalar must be different only, while the bracket part should be the same.
So, for the bracket part to be the same, k =5 (by comparing)

 

[Mayedah]

AQ = (2p + 5q)/6
AR = (2p + kq)/2
Note that they are collinear, so their scalar must be different only, while the bracket part should be the same.
So, for the bracket part to be the same, k =5 (by comparing)

Thnx

 

[syed1995]

thanks alotit was v helpful....... mere past papers me galat solve huawa tha so i got cnfused.........
thanks allllloooooottttttttt

Yep sometimes they tend to make mistakes .. even in the marking schemes too!

 

[hashim2]

how do i differentiate between an enlargement and stretch

 

[asd]

how do i differentiate between an enlargement and stretch

In enlargement, the whole figure is enlarged/diminished without it's shape being changed. In stretch, the figure will be stretched either upwards/sideways and the shape changes too. However, in a double stretch (two-way stretch) with the same stretch factor, you are actually enlarging the figure, and the shape remains the same, just it gets bigger.

 

[asd]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_s10_qp_11.pdf
20 part b.

 

[hashim2]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w10_qp_21.pdf

q10 part b
it is an enlargement but looks like a stretch. How can a person be absolutely sure which one it is?

 

[Sarah22]

see we have subtract height of triangle from the radius of the circle, see the picture and you will find out why.
to find heigh of triangle I divided the the triangle from O. angle will be halved, from 140 to 70
now apply Cos
COS 70 = h/9
h = cos70 x 9
thus subtract this figure from radius that is 9.
If u dont get it pls dont hesitate to ask again ..

i understood.. thank u..

 

[Mayedah]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_s10_qp_11.pdf
20 part b.

I guess it should be 2:5

 

[Mayedah]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w10_qp_21.pdf

q10 part b
it is an enlargement but looks like a stretch. How can a person be absolutely sure which one it is?

U can check by matrix !

 

[asd]

I guess it should be 2:5

reason?

 

[Mayedah]

I guess because it the length of the two same lines !
Whts the answer ?

 

[Mayedah]

U can check by matrix !

I did this question in first attempt but im now confused...this can be considered as a stretch too

 

[syed1995]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s10_qp_11.pdf
20 part b.

4:25 ..

l1^2:l2^2

2^2:5^2

that should be the answer.

oh wait i was doing part a.. nvm

answer should be 2:5

 

[asd]

I did this question in first attempt but im now confused...this can be considered as a stretch too

No, not stretch. If it was a stretch then there would have been no (6,0) but (6,2) instead. And, the point before y-axis would have moved to further left.
It is ONLY enlargement.