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The Area of equilateral triangle is  \frac{ \sqrt{3} }{4} a ^{2} .

where A is side of a triangle.
plz tell us what is a?
I told see my comment
oh yeah you said thanks
no problem ;)
Area of equilateral triangle = √3 a²/4
for simple Proof;---> see the attachment 
which is best for you ? if this then pick as best .