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Author Topic: MAth4 help  (Read 8383 times)

Offline sweetsh

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Re: MAth4 help
« Reply #15 on: May 17, 2009, 06:44:26 pm »
I asked eddie a question he didnt reply.
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #16 on: May 17, 2009, 06:48:46 pm »
ohh hell!!..
i'm so sorry..
i just 4got..
plz give me some time..
after finishing eating..
i'll surely answer it
it requires a graph paper..
veryyy sorry
« Last Edit: May 17, 2009, 07:01:52 pm by eddie_adi619 »
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Offline Priceless

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Re: MAth4 help
« Reply #17 on: May 17, 2009, 06:53:26 pm »
LOL oh ok can i b of any help? if u hv any probs sk me n i ll glad 2 help. but prob adi wud want 2 reply cuz he told u he wud ryt after eating....so LOL if u hv any other ques pls ask....n gud luck!!!
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #18 on: May 17, 2009, 06:55:53 pm »
soo sweetsh heres your answer..

first plot  the triangle in a graph paper
this will make it easy for you

now lets start with the first point - A (2,2)

remember: the invariant line is the y-axis

the formula says :SF = distance of image  from invariant / distance of object
therefore 1.5 = x/2 ("2" because the perpendicular distance of the point from the invariant line is 2units)
implies that x = 2*1.5 = 3
soo the co-ordinates of this point is (3,2)

repeat this method for the other points
sry for the delay once again
if any problem plz inform me
i'll try to help
thank you
good luck
byee
« Last Edit: May 17, 2009, 06:59:19 pm by eddie_adi619 »
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #19 on: May 17, 2009, 06:57:49 pm »
the answers for the other points of the triangle...

point B (5,2) will be mapped to (7.5,2)
point C (5,4) will be mapped to (7.4/4)


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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #20 on: May 17, 2009, 07:02:19 pm »
hope u have seen the answer  :) :)
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Offline Priceless

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Re: MAth4 help
« Reply #21 on: May 17, 2009, 07:03:58 pm »
ummm adi can u pls tell me wat ques this is n 4rm wat ppr? n very gud xplanation pretty clear n thnkz in advance.
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Offline sweetsh

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Re: MAth4 help
« Reply #22 on: May 17, 2009, 07:04:48 pm »
Thank you alot. It was my huge problem in math. God bless you!
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #23 on: May 17, 2009, 07:07:04 pm »
yeah sure..
it is 2004 oct/nov paper 4 math...Q 4.)f)i
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Offline Priceless

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Re: MAth4 help
« Reply #24 on: May 17, 2009, 07:09:14 pm »
thnkz once again adi n yes as sweetsh u said..u solved a huge prob in math dat ate my head up LOL thnku heapz..Take care..n best of luck again adi.
 :D
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zara

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Re: MAth4 help
« Reply #25 on: May 17, 2009, 07:09:31 pm »
plz help me in q7 part (c) oct/nov 2001 .....dunno hw to do it ???
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Offline sweetsh

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Re: MAth4 help
« Reply #26 on: May 17, 2009, 07:10:16 pm »
Another question, if they asked you to write the transformation matrix (- -
                                                                                       - -) what would you put it?
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #27 on: May 17, 2009, 07:11:00 pm »
@zara...cud u plz upload the paper...


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zara

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Re: MAth4 help
« Reply #28 on: May 17, 2009, 07:15:48 pm »
actually m hvin the hard copy n no soft copy....its nt der on FEP as well.. :-\
so ne1 hvin a soft copy plz plzzz upload it hea....
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #29 on: May 17, 2009, 07:18:22 pm »
@sweetsh..
i guess u r talking abt the next question

okk...heres how u do it

let the transformation matrix (2by2) be (a  b)
                                                      (c  d)

take 2 sets of co-ordinates from the object and arrange it vertically to form a 2 by 2 matrix
multiply it with the transformation matrix (abcd) and equate it to the corresponding sets of co-ordinates in the image
(again arranged vertically to form a 2 by 2 matrix)

lets take the points A and B

point  A - (2,2) gets mapped to (3,2)
point B  - (5,2) gets mapped to (7.5,2)

heres the equation desribed above

(2  5)   *   (a  b)    =    (3  7.5)
(2  2)       (c  d)           (2    2)

find the values of a,b,c,d by multiplying (3  7.5)    with the inverse of (2  5)
                                                       (2    2)                              (2  2)
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