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IGCSE/GCSE/O & A Level/IB/University Student Forum
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urgent help 4 maths paper 4
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Topic: urgent help 4 maths paper 4 (Read 3111 times)
godfather93
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urgent help 4 maths paper 4
«
on:
May 16, 2009, 09:49:14 pm »
can someone please explain this question to me? this question has got me completely spinning.
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Wahab09
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Re: urgent help 4 maths paper 4
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Reply #1 on:
May 16, 2009, 09:50:48 pm »
sure.. but which one?
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #2 on:
May 16, 2009, 09:52:01 pm »
sorry forgot to put the question!!
Question 9
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twilight
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Re: urgent help 4 maths paper 4
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Reply #3 on:
May 16, 2009, 09:55:49 pm »
the percentage of the total area which is shaded = shaded area/total area of the figure x 100
the fraction of the total shaded area = shaded area/total area of the figure
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Wahab09
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Re: urgent help 4 maths paper 4
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Reply #4 on:
May 16, 2009, 09:56:54 pm »
Yea thats a tricky one.. i dont think theyl bring somethin like that this year cuz its kinda old..
but for the first one.. its 1/4 * 100= 25% i think its straighforward..
and the rest ima need a pen and paper to get it goin
and By the way.. wat was question 6? also weird.. very hard..
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #5 on:
May 16, 2009, 09:57:39 pm »
but how did you get the shaded area?
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #6 on:
May 16, 2009, 10:11:45 pm »
astar please help!
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twilight
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Re: urgent help 4 maths paper 4
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Reply #7 on:
May 16, 2009, 10:14:08 pm »
get the shaded area in terms of h .. then the total area in terms of h .. and divide .. the h will get canceled
for the first diagram => answer is (0.5 x 1 x h) / (0.5 x 4 x h) x 100 = 1/4 x 100 = 25%
for the second diagram => (0.5 x 1 x h) / (4 x h) x 100 = 1/8 x 100 = 12.5%
got it?
«
Last Edit: May 16, 2009, 10:16:02 pm by twilight
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Words and hearts should be handled with care
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #8 on:
May 16, 2009, 10:17:26 pm »
i totally get it. Thank you very much. I was using the same method as you showed above before but i was making a very stupid mistake. I took the area, especially, of the triangle as being 1/4*b*h insteas of 1/8*b*h.
Thank you once again! (+rep)
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twilight
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Re: urgent help 4 maths paper 4
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Reply #9 on:
May 16, 2009, 10:18:56 pm »
ur welcum
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Words and hearts should be handled with care
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astarmathsandphysics
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Free the exam papers!
Re: urgent help 4 maths paper 4
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Reply #10 on:
May 16, 2009, 10:20:05 pm »
9a)25% since A=0.5base*height and the heights are the same.
b)12.5 since A=base *height for the paralellogram and 1/5base*height for the triangle
c)37.5 since if you cut the kite in half downwards the base is in the ratio 1:3 so shaded area is 75% of the triangle the half this
d)Divide the traezium into 3 triangles then ans=60%
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astarmathsandphysics
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Free the exam papers!
Re: urgent help 4 maths paper 4
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Reply #11 on:
May 16, 2009, 10:22:49 pm »
bi)20/180*100%
ii)pi*1^2/pi*5^2*100%=4%
ii)(pi3^2-pi2^2)/pi3^2=5/9=55.6%
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #12 on:
May 16, 2009, 10:25:56 pm »
thanks!
I understand the question now. I was making a silly mistake.
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godfather93
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Re: urgent help 4 maths paper 4
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Reply #13 on:
May 16, 2009, 10:35:13 pm »
oh. I'm stuck again at the same question. I don't get how to calculate the shaded area of diagram 4. That is a bit tricky.
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Wahab09
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Re: urgent help 4 maths paper 4
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Reply #14 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
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urgent help 4 maths paper 4