5. Emily had a play yard for her daughter Grace. It was shaped like a quare and had an area of 100 squar feet. What is the perimeter of the play yard? A. 10 feet C. 30 feet B. 20 feet D. 40 feet​

D    perimeter = 40 ft

Step-by-step explanation:

area square = s · s   = s²

preimeter square = s+s+s+s  = 4s

Given area = 100 ft²

area square   = s²

√area square   =  s

perimeter = 4s

perimeter = 4 · (√area square)

perimeter = 4 · (√100)

perimeter = 4 · (10)

perimeter = 40 ft