The triangle is equilateral, with a side length of 90 mm. The area of an equilateral triangle is given by:
$$A = \frac{\sqrt{3}}{4} a^2$$
where a is the side length. In this case, a = 90 mm = 0.09 m.
$$A = \frac{\sqrt{3}}{4} (0.09)^2 = \frac{\sqrt{3}}{4} (0.0081)
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