Three Charges in a Triangle

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Homework Statement



Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?

Homework Equations



U = K q1 q2 / r
K = 9*10^9
q = 1.6*10^-19

The Attempt at a Solution



First I made the triangle and tried to get the U of the three negative charges. I did (9*10^9)(1.6*10^-19)^2/(1*10^-9) and multiplied this by 3 because there are 3 different PE combinations with the negative charges and got 6.912*10^-19. Then i found it for the positive and negative charges and there are also 3 combinations for this. I calculated the distance from the negative to the positive charge to be .66 nm and then i used the same formula multiplied by 3 to get 1.05*10^-8.

Now I tried adding the PE's together but the first number is negligible compared to the second. I'm not sure if I made a mistake in calculating the radius, or if there is another point I'm missing on how to figure out the total PE. Thanks in advance.
 
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