If the length of a median of an equilateral triangle is \( x \mathrm{~cm} \), then its area, is ...

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If the length of a median of an equilateral triangle is \( x \mathrm{~cm} \), then its area, is
(a) \( x^{2} \)
(b) \( \frac{\sqrt{3}}{2} x^{2} \)
(c) \( \frac{x^{2}}{\sqrt{3}} \)
(d) \( \frac{x^{2}}{2} \)
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