$1\ \text{cm}^2$1\ \text{cm}^2

$\sqrt{3}\ \text{cm}^2$\sqrt{3}\ \text{cm}^2

$\sqrt{45}\ \text{cm}^2$\sqrt{45}\ \text{cm}^2

$3\ \text{cm}^2$3\ \text{cm}^2