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Equilateral Triangle Areas: Side Length $3$

GMAT-L6KO1L

What is the area of an equilateral triangle with side length $3$?

A

$ \cfrac{3\sqrt3}{4} $

B

$ \cfrac{3\sqrt3}{2} $

C

$ \cfrac{9\sqrt3}{4} $

D

$ \cfrac{9\sqrt3}{2} $

E

$9$