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anonymous
 4 years ago
If the altitude of an equilateral triangle is 12cm, find its area..
According to the answer sheet, answer is 83.1cm^2
anonymous
 4 years ago
If the altitude of an equilateral triangle is 12cm, find its area.. According to the answer sheet, answer is 83.1cm^2

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yeah looks good to me

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Erm.. How do you solve it?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328411891637:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0you 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 xdw:1328412007974:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0then 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
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328412341534:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328423226163:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328423349746:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328423488080:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Oh I didn't know :P We usually use np (no problem) in Sg
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