A Farmer Is Building a Triangular Fence

Multiple Choice

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