anonymous
  • anonymous
If the altitude of an equilateral triangle is 12cm, find its area.. According to the answer sheet, answer is 83.1cm^2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
yeah looks good to me
anonymous
  • anonymous
Erm.. How do you solve it?
anonymous
  • anonymous
|dw:1328411891637:dw|

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anonymous
  • anonymous
you need the base. now since this is an equilateral triangle, all sides are equal. and that is what we are looking for, one of the sides. lets call is it x|dw:1328412007974:dw|
anonymous
  • anonymous
ok..
anonymous
  • anonymous
then pythagoras tells you that \[(\frac{1}{2}x)^2+12^2=x^2\] \[12^2=x^2-\frac{1}{4}x^2\] \[144=\frac{3}{4}x^2\] \[x^2=144\times \frac{4}{3}=192\] \[x=\sqrt{192}=6\sqrt{3}\]
anonymous
  • anonymous
|dw:1328412341534:dw|
anonymous
  • anonymous
|dw:1328423226163:dw|
anonymous
  • anonymous
|dw:1328423349746:dw|
anonymous
  • anonymous
|dw:1328423488080:dw|
anonymous
  • anonymous
Thank you :)
anonymous
  • anonymous
yw
anonymous
  • anonymous
? yw?
anonymous
  • anonymous
your welcome
anonymous
  • anonymous
Oh I didn't know :P We usually use np (no problem) in Sg

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