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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Feb 2007 21:42:06 IST
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Hiiiiii folks, here's one question in which m badly stuck.... in a triangle ABC, the medians BE and CD intersect at right angles, then find the minimum value of cotB + cot C..... the answer is,(as u all we would hav guessed,) 2/sqrrt3....but i wanna knw the complete method of this question!!!
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Manasi....
NIT-Allahabad...
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Challenges are High, Dreams r New..
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check out the physics solution.
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will make it BIG! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Feb 2007 22:55:26 IST
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manasi where are u studying
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Feb 2007 22:56:34 IST
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nowhere, m studying on my own....y u asked???
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 13:59:23 IST
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gth
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:24:27 IST
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no reply
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:28:05 IST
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hey manasi i just tried out ur problem and i was usin the prop
in which angle in a semi circle is 90 degree we get 3 cricles
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:41:43 IST
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how this will help in solving the question!!!
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:55:19 IST
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(cotA+cotB+cotC)/3>=cot((A+B+C)/3)
cotB+cotC=sqroot(3)-cotA
this equality will hold only if A=B=C
then cotA+cot B=2/sqroot(3)
in equilateral triangle anglebisectors and medians r same and intersect at 90
but the problem is i havent used the prop that they intersect at right angles!!!!
that was why i was suggesting draw semicircles and use some gd prop there
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:56:25 IST
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btw shakir have u solved the physics subjective question in open test whr, thr were 5 plates nd some charge were given on it nd then potential difference was asked..... wat hav u got the answer??? m getting it 2 and the answer given in solution is 1....wat was urs???
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:58:10 IST
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shakir, medians of an equilateral triangle dnt intersect at rite angles, do they ...... nd if directly we take A=B=C, we can put the value of cot 60 directly....isnt it???
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 21:59:54 IST
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i did nt do that in paper but yes i tried at home and im vry confused that it is comin 2 as u r sayin . ya really a silly mistake i have commited actually bcoz i is a big doubt of urs i think i will have to solve the problem on paper. an draw diagram
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 22:02:32 IST
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it is cuming 2.....i did it in the paer too and at home also.... nd even some of my frnds are also getting 2...but the answer given is 1....newayz thanx
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Feb 2007 22:04:57 IST
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