Question

The length in metres of the side of a square with an area of 1600 m² is __ metres.

Answer 1

If the side of a square is a, its area is a².

According to question,

$a^2$ = 1600
$a^2$ = 2*2*2*2*10*10
a = $\sqrt{\underset{–}{2\ast 2}\ast \underset{–}{2\ast 2}\ast \underset{–}{10\ast 10}}$
$\downarrow \downarrow \downarrow$
$\text{2}\ast \text{2}\ast \text{10}$
a = 40 m