Question

how many feet of chain fence are necessary to enclose a dog pen that is square and has an area of 64 square feet?
a 256
b 64
c 32
d 16

Explanation:

Step1: Find side - length of square

For a square with area $A = 64$ square feet, use the formula $A=s^{2}$, where $s$ is the side - length. Solving for $s$, we get $s=\sqrt{A}$. So, $s = \sqrt{64}=8$ feet.

Step2: Calculate perimeter

The perimeter $P$ of a square is given by $P = 4s$. Substituting $s = 8$ feet, we have $P=4\times8 = 32$ feet.

Answer:

C. 32