Answer:
55.72 feet of fence
Explanation:
Kaitlyn´s garden is square, so we know that all the sides are the same in a square and the formula to get the area of a square is:
x*x=A
x^2=A
where:
x is one of the sides
A is the area,
So we know that A=345 square feet, so:
x^2 = 345 square feet
x = √345
x=18.57 feet
We know that she is going to put a fence around three sides and each side is 18.57 feet, so we have to multiply the sides by 3:
18.57 feet * 3 = 55.72 feet
She will need 55.72 feet of fence