Maths, Addmaths and Statistics: Post your doubts here!

[usama321]

better get over these silly mistakes examiner wont frgive u

yup

 

[asma tareen]

yup

well its better to make a mistake cux thn u realize u have to avoid this one in CIE

 

[usama321]

well its better to make a mistake cux thn u realize u have to avoid this one in CIE

only about 20 days left and m still making blunders,

 

[asma tareen]

only about 20 days left and m still making blunders,

well u're gonna attempt CIE paper more seriously everyone does i thnk

 

[Suchal Riaz]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s03_qp_2.pdf

q7 part A. anyone please?

1/2 of hemisphere, semi-circle and half of the cylinder is in contact with water.
curved surface area of 1/2 of hemisphere will be πr², 81π
semicircle: (9²π)/2=40.5π
cylinder in contact=πrh,9*18*π=
total=(40.5+162+81)π=891cm²

 

[usama321]

lets hope so

 

[Suchal Riaz]

till the time i type my answer someone else has already solved the question :'(
if someone else does not answer tag me in that post. i wont answer any other question which does does not call me to do so.

 

[asma tareen]

till the time i type my answer someone else has already solved the question :'(
if someone else does not answer tag me in that post. i wont answer any other question which does does not call me to do so.

still u were the quickest to solve it

 

[usama321]

till the time i type my answer someone else has already solved the question :'(
if someone else does not answer tag me in that post. i wont answer any other question which does does not call me to do so.

maybe a bit faster typing?

 

[fatima0000]

http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 7 (c) (i) and (ii)

 

[usama321]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 7 (c) (i) and (ii)

for c i. Use the formula (l1/l2) cube = v1/v2

for the other part. you have to think it out on the above diagram. Removing a pyramid from each of the vertices of the upper pyramid results in four more faces, resulting in an overall 8 faces

 

[fatima0000]

for c i. Use the formula (l1/l2) cube = v1/v2

for the other part. you have to think it out on the above diagram. Removing a pyramid from each of the vertices of the upper pyramid results in four more faces, resulting in an overall 8 faces

show me how you calculate the result for part (c) (i)

 

[usama321]

show me how you calculate the result for part (c) (i)

volume of first pyramid = 60.3
second pyramid volume would be 1/64 of it which is .9421875 cm cube

now. 60.3/.9421875 = (8/x) cube

x= 2

 

[usama321]

Suchal Riaz

Can you please help me with describing locus in three dimensions?

 

[Zoya Shahab]

Simplify (Lg 5)^2+lg 2 lg 50

 

[Suchal Riaz]

Suchal Riaz

Can you please help me with describing locus in three dimensions?

in three-dimension it is easier. look around u, lets say your fan is a point and for any fly to be 3m from fan she can be above it, below it left ot if or right of it. anywhere it but her distance will be same. exact is the case in a sphere. any point in a sphere is exactly same distance from centre but can be anywhere. so u get a sphere of 3m as radius. hope u get the concept.

 

[usama321]

in three-dimension it is easier. look around u, lets say your fan is a point and for any fly to be 3m from fan she can be above it, below it left ot if or right of it. anywhere it but her distance will be same. exact is the case in a sphere. any point in a sphere is exactly same distance from centre but can be anywhere. so u get a sphere of 3m as radius. hope u get the concept.

i kinda understand it now. But can you please give me a few more examples of what type of lines they can ask about. I mean what if they ask about a line equidistant from two points, do 3d locus apply in that condition too?

 

[Suchal Riaz]

i kinda understand it now. But can you please give me a few more examples of what type of lines they can ask about. I mean what if they ask about a line equidistant from two points, do 3d locus apply in that condition too?

if u know about 2d this wont be too difficult. 3d of circle is sphere.
if u want to hang anything 2m from a wall, build two walls 2m from it. any point on it will be 2m from the wall
if u have two planes(walls lets suppose) who interect(for example corner of a room) u will need to build a wall that intersect the angle between the two walls.

 

[usama321]

if u know about 2d this wont be too difficult. 3d of circle is sphere.
if u want to hang anything 2m from a wall, build two walls 2m from it. any point on it will be 2m from the wall
if u have two planes(walls lets suppose) who interect(for example corner of a room) u will need to build a wall that intersect the angle between the two walls.

thanks

 

[TheStallion-Reborn]

the xterior angle of a triangle is?? i mean the rule regarding oppostie interior angle adding up to become the xterior angle. i dont get it.....sum1 please xplain usama321