$\left(20\sqrt{3}+42\sqrt{2}\right)\ \text{cm}^2$

$\left(8\sqrt{2}+42\sqrt{2}\right)\ \text{cm}^2$

$\left(20\sqrt{3}-42\sqrt{2}\right)\ \text{cm}^2$

$\left(8\sqrt{21}+42\sqrt{2}\right)\ \text{cm}^2$

$\left(20\sqrt{3}-10\sqrt{2}\right)\ \text{cm}^2$