The zoo should use the Perimeter formula to calculate the amount of fencing needed for the tortoise pen, which is 180 feet.
The zoo should use the formula for Perimeter to determine how much fencing is needed to construct the pen. The formula for Perimeter of a rectangle is 2(length + width). In this case, the length is 50 feet and the width is 40 feet, so the perimeter would be: 2(50 + 40) = 2(90) = 180 feet of fencing required.
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