remember these formulae for equilateral triangles and you'll save important seconds.

s = side

area of equilateral triangle = \(\frac{s^2}{4}\sqrt{3}\), height = \(\frac{s}{2}\sqrt{3}\)

radius of circumscribe circle = \(\frac{s}{\sqrt{3}}\), radius of circumscribe circle = \(\frac{s}{2\sqrt{3}}\)

radius of circle = \(\frac{12}{\sqrt{3}} = 4\sqrt{3}\) .... s=12

area of circle = \(48\pi\)

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