« previous next »
Pages: 1 [2]   Go Down

Author Topic: urgent help 4 maths paper 4  (Read 2623 times)

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: urgent help 4 maths paper 4
« Reply #15 on: May 16, 2009, 10:41:12 pm »
The base of the trapezium is 3 times the base of the triangles, so cut the trapezium up into 3 equal triangles and EVERY triangle has the same area whether shaded or not.
Logged

Offline twilight

  • SF Senior Citizen
  • *****
  • Posts: 681
  • Reputation: 55
  • Gender: Female
  • wut u r in life depends on wut u choose..
Re: urgent help 4 maths paper 4
« Reply #16 on: May 16, 2009, 10:43:37 pm »
divide the shaded trapezium into 3 triangles
now all the small triangles would be equal .. so the % would be  3/5  x 100  = 60%
the 3 is the shaded and the 5 is the total number of triangles
Logged
Words and hearts should be handled with care
For words mis-spoken and hearts when broken are the hardest things to repair

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: urgent help 4 maths paper 4
« Reply #17 on: May 16, 2009, 10:43:53 pm »
how do you know the base of the trapezium is 3 times the base of the triangles?
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: urgent help 4 maths paper 4
« Reply #18 on: May 16, 2009, 10:45:23 pm »
Quote from: Wahab09 on May 16, 2009, 10:39:15 pm
dude stop stressin urself out.. this paper was ages ago its unlikely a question like that will come up..
they like to put a lil sequences ques at the end lately and theres many topics that didnt come on p2 that MUST come on p4 so theres no room for silly questions like these  ::)
how can you be so sure this question won't come up? You never know what may come up and it's better to clear your doubts before the exam.
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: urgent help 4 maths paper 4
« Reply #19 on: May 16, 2009, 10:47:59 pm »
Quote from: Wahab09 on May 16, 2009, 10:39:15 pm
dude stop stressin urself out.. this paper was ages ago its unlikely a question like that will come up..
they like to put a lil sequences ques at the end lately and theres many topics that didnt come on p2 that MUST come on p4 so theres no room for silly questions like these  ::)
and by the way this is no silly question cause it is challenging and not many people can do this question.
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: urgent help 4 maths paper 4
« Reply #20 on: May 16, 2009, 10:48:56 pm »
Because the height of the trapezium and the triangles are the same.
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: urgent help 4 maths paper 4
« Reply #21 on: May 16, 2009, 10:49:37 pm »
how does that make the bases the same ?
Logged

Offline twilight

  • SF Senior Citizen
  • *****
  • Posts: 681
  • Reputation: 55
  • Gender: Female
  • wut u r in life depends on wut u choose..
Re: urgent help 4 maths paper 4
« Reply #22 on: May 16, 2009, 10:50:45 pm »
look at the attachment i put .. the bigger triangle which is circled in red has its 2 sides divided equally .. and the base of the upper side of this triangle is parallel to the base of the bigger triangle .. and is similar to it
Logged
Words and hearts should be handled with care
For words mis-spoken and hearts when broken are the hardest things to repair

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: urgent help 4 maths paper 4
« Reply #23 on: May 16, 2009, 10:53:20 pm »
ahhhhh... now i get it!!! thanks so much for the help astar and twilight.
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: urgent help 4 maths paper 4
« Reply #24 on: May 16, 2009, 10:55:04 pm »
Sorry the base of the trapezium is twice the base of the triangle but the area is still 3 times.
Logged

Offline twilight

  • SF Senior Citizen
  • *****
  • Posts: 681
  • Reputation: 55
  • Gender: Female
  • wut u r in life depends on wut u choose..
Re: urgent help 4 maths paper 4
« Reply #25 on: May 16, 2009, 10:57:35 pm »
the base AB and EC are in the ratio 2:1 because AD and ED are in the ratio 2:1 .. so its because of the similarity
Logged
Words and hearts should be handled with care
For words mis-spoken and hearts when broken are the hardest things to repair
Pages: 1 [2]   Go Up
« previous next »