Question

If the area of a square lid is 0.0121 sq ft, then its side _____ ft.

• A. 0.01
• B. 0.11
• C. 0.21
• D. 0.31

Answer 1

The correct option is B 0.11

The area of the square lid is given as 0.0121 sq ft.

You know, $Length=\sqrt{Areaofasquare}$
Now, 0.0121 can be expressed as:
$0.0121=\frac{121}{10000}$
∴ Length of the square = $\sqrt{\frac{121}{10000}}=\sqrt{\frac{11\times 11}{100\times 100}}=\frac{11}{100}=0.11$ ft.