Author Topic: IGCSE MATHS Doubts  (Read 130738 times)

Offline The Golden Girl =D

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IGCSE MATHS Doubts
« on: April 24, 2010, 09:02:10 am »
okay i have this question that's soo annoying lol :P .....nov 07 question 7 ....part e and part c(i) ........ plz tell me how to get the image i tried the rule that says "transformation matrix * object = image" but it looks like  i got a problem with this applying this rule .....so plz help

plz answer me as soon as u possible !

ohhhh and everyone who has doubts, post urs here too  ;)


thx in advance
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Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #1 on: April 24, 2010, 09:34:45 am »
i'm waiting so plz help !  ???
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nid404

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Re: IGCSE MATHS Doubts
« Reply #2 on: April 24, 2010, 09:38:44 am »
15min

Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #3 on: April 24, 2010, 09:40:13 am »
15min


k ....i'll wait .thx By the way
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nid404

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Re: IGCSE MATHS Doubts
« Reply #4 on: April 24, 2010, 10:08:49 am »
So , what you do is, simply reflect the points how you do normally...the line of reflection being y=x

while reflecting, the points have to be equidistant on either sides of the mirror line(y=x) The dotted lines on my diagram will help

Traingle T has point ABC and the reflected T|  has points A|B|C| repectively

ask again if you need help

Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #5 on: April 24, 2010, 08:29:33 pm »
thx alot but u didn't answer part e of the question ..could u plz do ...and ohh plz tell me how to apply the rule i mentioned if i got lost and didn't know how to do it logically/mentally .....


thx in advance
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Offline astarmathsandphysics

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Re: IGCSE MATHS Doubts
« Reply #6 on: April 24, 2010, 09:31:44 pm »
Shortly

Offline astarmathsandphysics

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Re: IGCSE MATHS Doubts
« Reply #7 on: April 24, 2010, 10:48:20 pm »
Use tracing paper

Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #8 on: April 25, 2010, 02:22:09 pm »
um thx sir .....

sir, could u plz show me how to apply the rule i mentioned prior

thx in advance
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #9 on: April 25, 2010, 02:25:16 pm »
Do u want me to do the (e) part?

also, what rule are u talking about ? do u mean the (c) (ii) part??
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Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #10 on: April 25, 2010, 02:32:10 pm »
Do u want me to do the (e) part?

also, what rule are u talking about ? do u mean the (c) (ii) part??

ya sure  ........ um no this rule "transformation matrix * object = image" ......

 thx By the way  :)
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #11 on: April 25, 2010, 02:38:39 pm »
ok heres the (c) (ii) part

the formula i used = Object matrix * Transformation matrix = Image Matrix

The object matrix can contain 3 sets of values as the object is a triangle, however , as it is difficult to work with a 3*3 matrix, we'll go for only two sets of values from the triangle. TAke any two sets of vertices

I chose : A : (8,6)
             B : (6,10)

Now the image matrix will be A| : (6,8)
                                       B| : (10,6)

Arrange this in a form of matrix  (formula), note : the set of values is arranged vertically (column wise)

(8  6) * Transformation Matrix = (6  10)
(6 10)                                    (8   6)

Now by simple algebra we'll get --> Transformation Matrix = (6 10)  *  (8 6 )-1
                                                                                 (8  6)      (6 10)

The inverse of (8 6 )  is (10/44 -6/44)
                    (6 10)    (-6/44   8/44)


Therefore Transformation Matrix = (6 10) * (10/44  -6/44)  =  (0 1)
                                              (8   6)   (-6/44   8/44)       (1 0)

Thus the Transformation Matrix = (0 1)
                                             (1 0)
----------------------------------------
nest up, e part
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #12 on: April 25, 2010, 02:57:55 pm »
Ill upload the pic and send a link for e part. plz wait
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #13 on: April 25, 2010, 03:01:47 pm »
I cant upload the pic here, no clue y. ill try sending the solution to ur email id mentioned in ur SF profile. DO check

[EDIT] - Ok sent.
« Last Edit: April 25, 2010, 03:20:59 pm by A@di »
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Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #14 on: April 27, 2010, 11:19:40 am »
i did check it , thx By the way :D
Verily, in the remembrance of Allah do hearts find rest(13:28)

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