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The height of an equilateral triangle is √3/2 x side_length.

So for an equilateral triangle of side length 2a, the area is:

area = 1/2 x base x height

1/2 x (2a) x (√3/2 x 2a)

= √3 a2

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Q: What is the area of an equilateral triangle of side 2a?
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