The area of a square is 36 square feet. if each side is lengthened by 4 feet, how could the perimeter of the new square be calculated?

a.
divide 36 by 4 to get 9. then add 4 to 9 to get 13 and multiply this by 4 to get the new perimeter.

b.
divide 36 by 4 to get 9. then add 4 to 9 to get 13 and multiply this by 13 to get the new perimeter.

c.
an area of 36 means the original square was 6 feet long on a side. add 4 to 6 to get 10. then multiply by 4 to get the new perimeter.

d.
an area of 36 means the original square was 6 feet long on a side. so its perimeter was 24 feet. add 4 feet to this to get the new perimeter.