The angle between a lateral edge and the base of a regular tetragonal pyramid is 60 degrees and the lateral edge is 10 m long. A plane is drawn through the midpoint of one of the lateral edges at right angles to it.Find the area of the section? the answer is in the form \(\frac { { A }^{ 2 } }{ C } \sqrt { B }\). Find the value of A+B+C?

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