IGCSE MATHS Doubts

[mohit1234]

And its true, the first question, the rotational symmetry was 0. Cause you cant have a rotational symmetry of 1.

As far as i know, i lost out on the sinx - cosx = 0.5... i messed that sh*t up....

the rotational symmetry was 1. u can hve a rotational symmetry of 1!!

[Shazizzzle]

Is there Rotational Symmetry of Order 1 ?
Not really! If a shape only matches itself once as you go around (ie it matches itself after one full rotation) there is really no symmetry at all, because the word "Symmetry" comes from syn- together and metron measure, and there can't be "together" if there is just one thing.)

http://www.mathsisfun.com/geometry/symmetry-rotational.html

[Shazizzzle]

Umm, looking forward to paper 4 now.
What's done is done.
So I screwed up a question worth 2 marks. Just hope I get 1/2 of those for the working.
Let's not dwell on past mistakes. That just ruins the future too.

So, Paper4?
Shitty questions: Probability and Sequence.
That's all I fear for.

[mohit1234]

Is there Rotational Symmetry of Order 1 ?
Not really! If a shape only matches itself once as you go around (ie it matches itself after one full rotation) there is really no symmetry at all, because the word "Symmetry" comes from syn- together and metron measure, and there can't be "together" if there is just one thing.)

http://www.mathsisfun.com/geometry/symmetry-rotational.html

oh..then i got another one wrong
hope cie give both 1 and 0 right  

[Dibss]

from a website >>Is there Rotational Symmetry of Order 1? Not really! If a shape only matches itself once as you go around (ie it matches itself after one full rotation) there is really no symmetry at all, because the word "Symmetry" comes from syn- together and metron measure, and there can't be "together" if there is just one thing.)
from a different site >>  "A" has got rotational symmetry of order 1. This is just a complicated why of saying that you can not turn "A" around to any other position so it looks the same.
So rotational symmetry order of 1 means NO rotational symmetry (we can't rotate it).

----does this mean that the first answer could be 1 OR 0 or what?

EDIT: shazizzle, looks like we both ended up at google for the same reason! haha

[Shazizzzle]

from a website >>Is there Rotational Symmetry of Order 1? Not really! If a shape only matches itself once as you go around (ie it matches itself after one full rotation) there is really no symmetry at all, because the word "Symmetry" comes from syn- together and metron measure, and there can't be "together" if there is just one thing.)
from a different site >>  "A" has got rotational symmetry of order 1. This is just a complicated why of saying that you can not turn "A" around to any other position so it looks the same.
So rotational symmetry order of 1 means NO rotational symmetry (we can't rotate it).

----does this mean that the first answer could be 1 OR 0 or what?

EDIT: shazizzle, looks like we both ended up at google for the same reason! haha

Haha! Yeah. Google FTW! XD

Okay, umm, this is for CIE to worry about.
You wrote what you thought. And It's 1 mark. So it's their problem now.

I think they should accept both.

Or ima march all the way down there and shove this site into their faces. XD

[The Golden Girl =D]

ANywaysss.. looks like we all did good. atleast we all got more than 60 sa7???

inshAllah ....

[The Golden Girl =D]

yep middle/right
it was 37.something+circumference of first circle = 88 <--answer

ya i did mine in the middle

[Dibss]

I think they should accept both.

Or ima march all the way down there and shove this site into their faces. XD

HAHA i'll even lend you my amazing marching boots as long as you show them both sites

[The Golden Girl =D]

i got y=3x-13, but is this the question u are talking abt

ya i got the same answer as urs ..lol

[The Golden Girl =D]

Umm, looking forward to paper 4 now.
What's done is done.
So I screwed up a question worth 2 marks. Just hope I get 1/2 of those for the working.
Let's not dwell on past mistakes. That just ruins the future too.

So, Paper4?
sh*tty questions: Probability and Sequence.
That's all I fear for.

ya inshallah paper 4 turns out well ....ohh i totally agree abt the dwellin part  

gd luck everyone in all ur exams   .....

[Borat3169]

Hey what did u guyz get for the Boris and other guyz question?? The one where they travel the same distance in same time and it wants you to find v?? I pooped that question,I got like 16. smthng plzz write the answer !!! 

[The Golden Girl =D]

Hey what did u guyz get for the Boris and other guyz question?? The one where they travel the same distance in same time and it wants you to find v?? I pooped that question,I got like 16. smthng plzz write the answer !!! 

read the previous replies and u'll kno ....but By the way ur answer is right but what equations did u use ..in other words , how did  solve it ? .... i got it 18smthn which is wrong -_-

[holtadit]

Take it from me; the order of rotational symmetry was ZERO

[Dibss]

ya inshallah paper 4 turns out well ....ohh i totally agree abt the dwellin part  
gd luck everyone in all ur exams   .....

GOOD LUCK FOR PAPER 4
Inshallah it'll be even better than P2

Hey what did u guyz get for the Boris and other guyz question?? The one where they travel the same distance in same time and it wants you to find v?? I pooped that question,I got like 16. smthng plzz write the answer !!!  Cry

Borat, 16.25 SMILE

Golden girl, you find alonso's total distance (area under the graph) and get 130m
then for boris you do 1/2 x v x16=130
v=16.25

time for me to go hit the books!