To find area $ A $ use formula:
$$ A = a \cdot h $$After substituting $a = 2.29\, \text{cm}$ and $h = 1.5\, \text{cm}$ we have:
$$ A = 2.29\, \text{cm} \cdot 1.5\, \text{cm} $$$$ A = 2.29\, \text{cm} \cdot 1.5\, \text{cm} $$$$ A = 3.435\, \text{cm}^2 $$