anonymous
  • anonymous
Side length of equilateral triangle? (I have to draw it)
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1350739907443:dw|
anonymous
  • anonymous
U mean length of BC
anonymous
  • anonymous
yes, ABC is equilateral so any side...

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anonymous
  • anonymous
4/sqrt(3) ?
anonymous
  • anonymous
Sorry, try again...
anonymous
  • anonymous
4 + 2/sqrt(3)
anonymous
  • anonymous
Um...no.
anonymous
  • anonymous
|dw:1350740356848:dw|
anonymous
  • anonymous
|dw:1350740418399:dw|
anonymous
  • anonymous
|dw:1350740461276:dw|
anonymous
  • anonymous
How u get 30?
anonymous
  • anonymous
Hint - make a transformation
anonymous
  • anonymous
i wasnt thinkin g sorry.. .let me think
anonymous
  • anonymous
U didn't like my hint?
anonymous
  • anonymous
No!
anonymous
  • anonymous
Imagine that the slant line is the x-axis and shift the triangle "up" 2 so that A is at the origin. Now try it...
anonymous
  • anonymous
trying
anonymous
  • anonymous
U see what I mean? Now if you drop the perpendiculars from B and C, they will 5 and 4
anonymous
  • anonymous
dont post any more hints.. plz
anonymous
  • anonymous
|dw:1350742011463:dw|
anonymous
  • anonymous
4 sqrt 2
anonymous
  • anonymous
Nope, sorry.
anonymous
  • anonymous
I'm getting worried now, I better check my answer... This is Pythagorus and some algebra, right?
anonymous
  • anonymous
im getting 3 quadratics wid 3 variables
anonymous
  • anonymous
|dw:1350743128666:dw|
anonymous
  • anonymous
I guess Now, using cosine rule and sine rule will give x and y.
anonymous
  • anonymous
|dw:1350743084775:dw|
anonymous
  • anonymous
is it 6.4291 ?
anonymous
  • anonymous
I have 2 sqrt 7
anonymous
  • anonymous
First 2 equations give s^2-t^2 = 9 Second and third give s^2 -2st =24 t = (s^2-24)/2s substitute in s^2-t^2 gives a quadratic in s etc.
anonymous
  • anonymous
I think Sara was closest...
anonymous
  • anonymous
2 Attachments
anonymous
  • anonymous
Where did I go wrong???
anonymous
  • anonymous
I will have a look later on.....
anonymous
  • anonymous
okay!
anonymous
  • anonymous
Thanx @shubhamsrg AND yes there was a mistake in cosine law. Now, that gives the length 5.2915
anonymous
  • anonymous
Which looks correct.
shubhamsrg
  • shubhamsrg
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>>
anonymous
  • anonymous
Ah, u found it, good:-)

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