She used 15.7 ft of wire barrier to protect her tomato plant.
If the wire barrier is 2.5ft from the tomato plant in every direction, then it forms a circle of radius r = 2.5ft
Remember that for a circle of radius r, the perimeter or circumference is:
[tex]C = 2*pi*r[/tex]
where pi = 3.14
Then for this case, where r = 2.5ft, we have:
[tex]C = 2*3.14*2.5ft = 15.7ft[/tex]
Then she used 15.7 ft of wire barrier to protect her tomato plant.
If you want to learn more about circles:
https://brainly.com/question/1559324
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