A farmer is building a triangular fence. He has enough fencing for two sides of the fence. One side of the fence has length 5 feet, and the other side has length 12 feet. The amount of fencing needed for the third side is given by the fomula 
. Find the amount of fencing needed to be purchased by the farmer for the third side.
A. 13 feet
B. 12 feet
C. 5 feet
D. 169 feet
E. none of these
Answer: A
Mathematics
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