Three identical point charges, Q, are placed at the vertices of an equilateral triangle as shown in the figure(can't post figure). The length of each side of the triangle is d. Determine the magnitude and direction of the total electrostatic force on the charge at the top of the triangle.

I have the answer here but I don't know exactly how it was calculated. Can anyone give me a step by step solution? For example, how the formula for the area of an equilateral triangle combines with the final solution...The solution looks similar to that formula with the addition of the Q^2 replacing S^2 in the numerator and the pi, d^2 and the greek e looking letter in the denominator...Help??

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