estudier
Side length of equilateral triangle?
(I have to draw it)



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estudier
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dw:1350739907443:dw

sauravshakya
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U mean length of BC

estudier
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yes, ABC is equilateral so any side...

sara12345
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4/sqrt(3) ?

estudier
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Sorry, try again...

sara12345
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4 + 2/sqrt(3)

estudier
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Um...no.

sara12345
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dw:1350740356848:dw

sara12345
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dw:1350740418399:dw

sara12345
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dw:1350740461276:dw

estudier
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How u get 30?

estudier
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Hint  make a transformation

sara12345
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i wasnt thinkin g sorry.. .let me think

estudier
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U didn't like my hint?

estudier
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No!

estudier
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Imagine that the slant line is the xaxis and shift the triangle "up" 2 so that A is at the origin.
Now try it...

sara12345
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trying

estudier
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U see what I mean? Now if you drop the perpendiculars from B and C, they will 5 and 4

sara12345
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dont post any more hints.. plz

estudier
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dw:1350742011463:dw

Kashan
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4 sqrt 2

estudier
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Nope, sorry.

estudier
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I'm getting worried now, I better check my answer...
This is Pythagorus and some algebra, right?

sara12345
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im getting 3 quadratics wid 3 variables

sauravshakya
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dw:1350743128666:dw

sauravshakya
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I guess Now, using cosine rule and sine rule will give x and y.

estudier
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dw:1350743084775:dw

sauravshakya
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is it 6.4291 ?

estudier
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I have 2 sqrt 7

estudier
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First 2 equations give s^2t^2 = 9
Second and third give s^2 2st =24
t = (s^224)/2s substitute in s^2t^2 gives a quadratic in s etc.

estudier
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I think Sara was closest...

sauravshakya
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sauravshakya
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Where did I go wrong???

estudier
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I will have a look later on.....

sauravshakya
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okay!

sauravshakya
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Thanx @shubhamsrg AND yes there was a mistake in cosine law.
Now, that gives the length 5.2915

sauravshakya
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Which looks correct.

shubhamsrg
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you did all the work buddy,, as i said,,a human error..i do more mistakes than that in my work.,,
anyways,,good job YET AGAIN>>

estudier
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Ah, u found it, good:)