How do we solve this ?

Say that each side the equilateral triangle is of length a\bf a units.
It is well known that the area of an equilateral triangle is 34a2\dfrac{\sqrt{3}}{4}\bf{a}^2 SEE THIS
Using the given area of 3\sqrt 3 can you show that a=2 ?\bf{a}=2~?
Now finish! Post your result for any further help.

 
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