Question

How many feet ofchain fence are nec-essary to enclose adog pen that issquare and has anarea of 144 squarefeet?

Answer 1

Remember that

the area of a square is

A=b^2

where

b is the long side of the square

we have

A=144 ft2

substitute

144=b^2

solve for b

b=12 ft

The perimeter of a square is

P=4b

substitute

P=4*12

P=48 ft

therefore

the answer is

48 feet of chain fence are necessary