Answer:
Option 2nd is correct
[tex]s = \sqrt{81}[/tex] inches
Step-by-step explanation:
The area of a square can be found using the equation:
[tex]A=s^2[/tex] ....[1]
where,
A is the area of square
s is the measure of one side of the square.
Given that:
A square has an area of 81 square inches.
⇒A = 81
Substitute in [1] we have;
[tex]s^2 = 81[/tex]
⇒[tex]s =\pm \sqrt{81}[/tex]
∵Side of square cannot be in negative.
⇒[tex]s = \sqrt{81}[/tex] inches
Therefore:
A square has an area of 81 square inches →[tex]s = \sqrt{81}[/tex] in
