How many feet of chain fence are necessary to enclosed a dog pen that is square and has a area of 64 sq feet

32 feet

Step-by-step explanation:

area of square is given by side^2

Perimeter of  square is given by 4*side

Given

area of square = 64 sq feet

side^2 = 64

side^2 = 8^2

side = 8

thus side = 8 feet

The dog pen is fenced with chain, hence chain will be fence at the edge of square and at the perimeter.

Thus, length of chain required will be same as the Perimeter of  square.

Perimeter of given dog pen with side length 8 feet = 4*8 = 32 feet.

Thus, 32 feet of chain fence is required.