Question

The area of a square tile is 324 square units. What is the length of each side of the tile?

• A. 16 units
• B. 17 units
• C. 18 units
• D. 22 units

Answer 1

The correct option is C

18 units

The area of a square with side $a=a^2$
$\therefore a^2=324\Rightarrow a=\sqrt{324}$
$=\sqrt{2\times 2\times 3\times 3\times 3\times 3}$
= 2 $\times$ 3 $\times$ 3
= 18 units