Answer:
13.25 ft
Explanation:
Perimeter = P = 2L + 2w
L = 19.75
P = 66
66 = 2(19.75) + 2w
2w = 66 - 39.5 = 26.5
width = w = 26.5/2 = 13.25
final answer: width = 13.25 ft
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