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gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pm; Location: Paris, France; Thanked: 71 times; Followed by:17 members; GMAT Score:710

by gmat740 » Tue May 26, 2009 12:29 pm

I doubt the solution

In an equilateral triangle :

Altitude or Height = sqrt(3)/2 times of a

where a= side of the equilateral triangle(this can be easily proved with the help of trigonometry)

So 4/sqrt(3) = [sqrt(3)/2]*a

a = 8/3

So perimeter = 3a = 8

Please check again

Thanks

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dumb.doofus: Master | Next Rank: 500 Posts; Posts: 435; Joined: Sat Sep 27, 2008 2:02 pm; Location: San Jose, CA; Thanked: 43 times; Followed by:1 members; GMAT Score:720

by dumb.doofus » Tue May 26, 2009 1:28 pm

gmat740 wrote:I doubt the solution

In an equilateral triangle :

Altitude or Height = sqrt(3)/2 times of a

where a= side of the equilateral triangle(this can be easily proved with the help of trigonometry)

So 4/sqrt(3) = [sqrt(3)/2]*a

a = 8/3

So perimeter = 3a = 8

Please check again

Thanks

Bold statement above .. incorrectly written.. its 4root(3) and not 4/root(3)

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gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pm; Location: Paris, France; Thanked: 71 times; Followed by:17 members; GMAT Score:710

by gmat740 » Tue May 26, 2009 6:49 pm

Oh!
Silly Mistake!

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