To find height $ h $ use formula:
$$ A = a \cdot h $$After substituting $A = 214\, \text{cm}$ and $a = 16\, \text{cm}$ we have:
$$ 214\, \text{cm} = 16\, \text{cm} \cdot h $$$$ h = \dfrac{ 214\, \text{cm} }{ 16\, \text{cm} } $$$$ h = \frac{ 107 }{ 8 } $$