To find area $ A $ use formula:
$$ A = a \cdot h $$After substituting $a = 3 \sqrt{ 22 }\, \text{cm}$ and $h = 18\, \text{cm}$ we have:
$$ A = 3 \sqrt{ 22 }\, \text{cm} \cdot 18\, \text{cm} $$$$ A = 3 \sqrt{ 22 }\, \text{cm} \cdot 18\, \text{cm} $$$$ A = 54 \sqrt{ 22 }\, \text{cm}^2 $$