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Author Topic: Oct/Nov 2008 - Math  (Read 5318 times)

Offline Diablo

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Oct/Nov 2008 - Math
« on: October 25, 2009, 01:23:10 pm »
Hiya!

I was always curious how would final answer look like; I solved this ages ago, but I was never sure of the answer. Can someone upload a picture of the answer? I'd appreciate it.

Thanks in advance  :D


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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #1 on: October 25, 2009, 01:39:39 pm »
hey that is easy
first take ur compass then mark equal distance BD then make an arc app. make a circle towards the right of B keeping the center B
then take the compass and  measure BC without moving or changing it, place the pointer(the fixed point) on C
draw the arc such that it cuts the previous one
the intersection is known as point D' (image of D)
« Last Edit: October 25, 2009, 01:48:21 pm by ~~~~shreycool~~~~ »
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #2 on: October 25, 2009, 01:41:35 pm »
Quote from: ~~~~shreycool~~~~ on October 25, 2009, 01:39:39 pm
hey that is easy
first take ur compass then mark equal distance BC then make an arc app. at 900 towards right of point B
then take the compass and  measure BC without moving or changing it, place the pointer(the fixed point) on C
draw the arc such that it cuts the previous one
the intersection is known as point D' (image of D)

wat abt the locus of the points?
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #3 on: October 25, 2009, 01:47:04 pm »
Quote from: | am | on October 25, 2009, 01:41:35 pm
wat abt the locus of the points?

maybe something like this
PS : the shaded region is the locus (i too am a little doubtful abt this)

EDITED : REmoved the shaded region..only a line (arc) the red line
« Last Edit: October 25, 2009, 02:06:37 pm by | am | »
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #4 on: October 25, 2009, 01:54:28 pm »
actually aadi i feel ur diagram is right
they are asking locus of B why are you shading
Locus of point B is shown by the dotted lines in my figure!!
« Last Edit: October 25, 2009, 01:59:07 pm by ~~~~shreycool~~~~ »
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #5 on: October 25, 2009, 02:02:57 pm »
oops i feel some diagram error wait a sec let me configure it..
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #6 on: October 25, 2009, 02:07:39 pm »
Quote from: ~~~~shreycool~~~~ on October 25, 2009, 01:54:28 pm
actually aadi i feel ur diagram is right
they are asking locus of B why are you shading
Locus of point B is shown by the dotted lines in my figure!!


B is the origin and locus of D is asked

edited my post
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #7 on: October 25, 2009, 02:08:38 pm »
so is my answer rite or not???
i guess it is the same as yours???
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #8 on: October 25, 2009, 02:09:38 pm »
Quote from: ~~~~shreycool~~~~ on October 25, 2009, 02:08:38 pm
so is my answer rite or not???
i guess it is the same as yours???

modify it to a solid line..Locus of B aint asked...locus of D is asked...B is the origin
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #9 on: October 25, 2009, 02:11:22 pm »
so in ur diagram
the red lines are locus of D???
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #10 on: October 25, 2009, 02:14:47 pm »
Quote from: ~~~~shreycool~~~~ on October 25, 2009, 02:11:22 pm
so in ur diagram
the red lines are locus of D???

yea..the arc..
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #11 on: October 25, 2009, 02:16:07 pm »
how can the line C'D' and C'B can be locus for D???
or is it only the curve that is locus??
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Offline Ghost Of Highbury

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Re: Oct/Nov 2008 - Math
« Reply #12 on: October 25, 2009, 02:21:45 pm »
Quote from: | am | on October 25, 2009, 02:14:47 pm
yea..the arc..

read the latter part again..
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Offline ~~~~shreyapril~~~~

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Re: Oct/Nov 2008 - Math
« Reply #13 on: October 25, 2009, 02:22:58 pm »
kk
got it
hope that diablo gets it tooo :P :P :P
« Last Edit: October 25, 2009, 02:25:58 pm by ~~~~shreycool~~~~ »
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Offline SGVaibhav

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Re: Oct/Nov 2008 - Math
« Reply #14 on: October 25, 2009, 02:35:24 pm »
omg , is it solved ???
if not, i will solve it in a easy way :D
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