$\text{cm}^2$ (square centimeter), $m^2$ (square meter), $\text{km}^2$ (square kilometer).

**These units are different, but they are related:**

$1\text{km}^2=1,000,000\text{m}^2$

$1\text{m}^2=10,000\text{cm}^2$

Understanding the relationship between these units is key, but there's no need to memorize it—we can quickly calculate it when needed.

**Let's say we want to calculate how many** **$\text{cm}^2$**** are in** **$1\text{m}^2$****. We’ll draw a square whose sides each measure** **$1$**** meter:**

**To calculate the area of the square, we need to multiply the length of one side by the other (this is a well-known formula). In our case:**

The area of the square $=1\text{m}\times1\text{m}$.

**The result is** **$1$**** m² or, writing it another way:**

$A=1\text{m}^2$