Question

How many square metres is equal to 20 square centimetres?

• A. 0.2
• B. 0.02
• C. 0.002
• D. 0.0002

Answer 1

The correct option is C 0.002

We know that 1 m = 100 cm
1 cm = $\frac{1}{100}$m

So, 1 $m^2$ = (1 m $\times$ 1 m) = $1m^2$
$\Rightarrow$ 1 $m^2$ = (100 $\times$ 100) $c{m}^2$
$\Rightarrow$ 1 $c{m}^2$ = $\frac{1}{100\times 100}$ $m^2$
​​​​​$\Rightarrow$ 20 $c{m}^2$ = $\frac{20}{(100\times 100)}$

Canceling the zeroes we have
$\frac{2}{1000}$ = 0.002 $m^2$

$\therefore 20c{m}^2=0.002m^2$