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Author Topic: MAth4 help  (Read 8232 times)

Offline shan2391

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MAth4 help
« on: May 17, 2009, 05:18:05 pm »
Q 7c(i) June 2002 can someone explain the method.
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #1 on: May 17, 2009, 05:23:44 pm »
reflection in y=-x
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Offline shan2391

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Re: MAth4 help
« Reply #2 on: May 17, 2009, 05:25:24 pm »
how did u get it
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #3 on: May 17, 2009, 05:25:49 pm »
these are few very good notes provided by priceless in a post..
hope it helps u

Lol ya sure np. umm ok here v go.

Reflection:

1. reflection in ml y=x it's (0 1)
                                   (1 0)

2. refelction in ml y=-x itz (0 -1)
                                    (-1 0)

3. refelction in x-axis itz (1 0)
                                 (0 -1)

4. reflection in y-axis itz (-1 0)
                                  (0  1)

Rotation

1. rotation +90 degrees(anticlockwise) around centre(0,0)  itz (0 -1)
                                                                                    (1  0)

2. rotation -90 degrees(clockwise) around centre (0,0)  itz (0  1)
                                                                               (-1 0)

3. rotation 180 degrees around centre (0,0)  itz (-1 0)
                                                                 (0 -1)

Enlargement

1. centre (0,0) wer k=scale factor, itz (k 0)
                                                    (0 k)

Shear

1. x invariant with x-axis wer k=scale factor (1 k)
                                                            (0 1)

2. y invariant with y-axis wer k=scale factor (1 0)
                                                            (k 1)

Stretch

1. x invariant with y-axis wer k=scale factor (1 0)
                                                            (0 k)

2. y invariant with x-axis wer k=scale factor (k 0)
                                                            (0 1)
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #4 on: May 17, 2009, 05:26:34 pm »
i was told to byheart them...and thus i remembered...
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Offline sweetsh

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Re: MAth4 help
« Reply #5 on: May 17, 2009, 05:27:35 pm »
A question that is asked by many!

How is shear applied?
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #6 on: May 17, 2009, 05:36:52 pm »
Shear is the transformation that keeps one line fixed, moves all the other points paralled to this line.
A transformation in which all points along a given line  remain fixed while other points are shifted parallel to by a distance proportional to their perpendicular distance from . Shearing a plane figure does not change its area.

the formula => shear factor = distance a point moves/ distance of the point from the invariant line

any past paper question on shear
may be i can help
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Offline sweetsh

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Re: MAth4 help
« Reply #7 on: May 17, 2009, 05:53:10 pm »
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zara

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Re: MAth4 help
« Reply #8 on: May 17, 2009, 06:29:47 pm »
@eddie_adi619

can u plz also tll the formula for stretch factor ???
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #9 on: May 17, 2009, 06:32:21 pm »
sure..
its  SF = distance of the image of a point from the invariant line / distance of the point from the invariant line

thank you
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zara

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Re: MAth4 help
« Reply #10 on: May 17, 2009, 06:36:05 pm »
thank you!! :)
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Offline Priceless

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Re: MAth4 help
« Reply #11 on: May 17, 2009, 06:39:06 pm »
whoa adi u mite b taking ur xam in nov but ur sum smart guy....u wud hv no probs wid da pprs hopefully n i ll pray 4 u. gud luck 4 ur upcoming xams though n thnkz 4 all da help. Take care
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Offline Ghost Of Highbury

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Re: MAth4 help
« Reply #12 on: May 17, 2009, 06:40:13 pm »
thank u  :)
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Offline sweetsh

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Re: MAth4 help
« Reply #13 on: May 17, 2009, 06:40:41 pm »
E7m e7m...ummm...
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Offline Priceless

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Re: MAth4 help
« Reply #14 on: May 17, 2009, 06:42:10 pm »
ur welcum adi n sweetsh wats dat supposed 2 mean? sory i didnt get u?
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