IB HL Maths

• wee_ws

  5 Dec 08, 07:35

  Hi,
  
    Feel free to post any queries on HL maths :)

    Btw, there are VERY MANY similarities between A-level H2 maths and IB HL maths. Students taking HL maths could look to H2 maths questions (say, from Dyna Publisher's H2 maths ten-year-series) for further practice. You may also visit my website for learning resources at

    www.freewebs.com/weews

    Thanks!

  Cheers,
  Wen Shih

• skythewood

  5 Dec 08, 09:12

  new competitor appears

• wee_ws

  5 Dec 08, 09:17

  Hi,

    Instead of competing (which usually ends up in a win-lose or lose-lose outcome), it's better to collaborate to achieve a win-win situation for all concerned :)

  Cheers,
  Wen Shih

• eagle

  5 Dec 08, 09:18

  competitor?

• eagle

  5 Dec 08, 09:21

  Originally posted by wee_ws:

  Hi,

    Instead of competing (which usually ends up in a win-lose or lose-lose outcome), it's better to collaborate to achieve a win-win situation for all concerned :)

  Cheers,
  Wen Shih

  I will need to learn from you on how to use and teach graphic calculators :D

  That's the main obstacle preventing me from teaching JC maths

• wee_ws

  5 Dec 08, 11:00

  Hi,

    I will be very happy to share with you what I know :)

  Cheers,
  Wen Shih

• wee_ws

  6 Dec 08, 18:57

  Hi,

    Here is a question from May '08 IB Maths HL paper 1, to kickstart a discussion:

  A circular disc is cut into twelve sectors whose areas are in an arithmetic sequence.

  The angle of the largest sector is twice the angle of the smallest sector.

  Find the size of the angle of the smallest sector.

    Thanks!

  Cheers,
  Wen Shih

• Ahm97sic

  6 Dec 08, 21:03

  Entry is deleted.

• 35sadboy

  7 Dec 08, 08:15

  let a_1 denote angle of smallest sector and a_12 the largest angle, then using sum of arithmetic progression, we have following 2 equations

   

  360 = [12(a_1 + a_12)]/2

  a_12 = 2 a_1, so we just use all 3 equations to find that a_1 = 20 degrees.

• wee_ws

  7 Dec 08, 10:04

  Hi 35sadboy,
  
    Correct :)
  
    Maths HL tends to assess salient knowledge of maths. H2 maths go deeper at times.

  Cheers,
  Wen Shih

• wee_ws

  7 Dec 08, 19:39

  Hi,

    A new question from May '07 IB Maths HL paper 1:

   

   

   

  The function

  f is defined as f (x) = sin x ln x for x \in [0.5, 3.5].

  (a) Write down the

  x-intercepts.

  (b) The area above the

  x-axis is A and the total area below the x-axis is B. If A = kB, find k.

    Enjoy!
  
  Cheers,
  Wen Shih