Author Topic: Oct/Nov 2008 - Math  (Read 5419 times)

Offline Diablo

  • SF Citizen
  • ***
  • Posts: 146
  • Reputation: 101
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



Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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~~~~ »
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #2 on: October 25, 2009, 01:41:35 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?
divine intervention!

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #3 on: October 25, 2009, 01:47:04 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 | »
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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~~~~ »
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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..
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #6 on: October 25, 2009, 02:07:39 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
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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???
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #8 on: October 25, 2009, 02:09:38 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
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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???
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #10 on: October 25, 2009, 02:14:47 pm »
so in ur diagram
the red lines are locus of D???

yea..the arc..
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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??
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Oct/Nov 2008 - Math
« Reply #12 on: October 25, 2009, 02:21:45 pm »
yea..the arc..

read the latter part again..
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
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~~~~ »
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
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