Answer:
C. 100 meters
Step-by-step explanation:
area of a square = [tex]x^{2}[/tex], where x is the length of one side
10,000 = [tex]x^{2}[/tex]
[tex]10000^{\frac{1}{2} }[/tex] = x
[tex]\sqrt{10000}[/tex] = x
square root of 10000 is 100
100 = x
100 meters = length
