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Author Topic: urgent help 4 maths paper 4  (Read 3045 times)

Offline astarmathsandphysics

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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.
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Offline twilight

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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
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Offline godfather93

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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?
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Offline godfather93

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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.
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Offline godfather93

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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.
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Offline astarmathsandphysics

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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.
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Offline godfather93

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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 ?
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Offline twilight

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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
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Offline godfather93

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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.
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Offline astarmathsandphysics

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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.
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Offline twilight

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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
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