She used 15.7 ft of wire barrier to protect her tomato plant.
How long is the wire barrier?
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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