Question

The area of a square is 8100 sq cm. The length of its side is equal to

• A. 6 cm
• B. 12 cm
• C. 18 cm
• D. 24 cm

Answer 1

The correct option is B 12 cm

The area of a square of side 'a' is equal to $a^2$
So, $a^2$ = 8100 $c{m}^2$
We know that 81 = $9\times 9$ ,
Hence 8100 = $90\times 90$
a = 90 cm