To find area $ A $ use formula:
$$ A = a \cdot b $$After substituting $a = 3.5\, \text{cm}$ and $b = 1.7\, \text{cm}$ we have:
$$ A = 3.5\, \text{cm} \cdot 1.7\, \text{cm} $$$$ A = 3.5\, \text{cm} \cdot 1.7\, \text{cm} $$$$ A = 5.95\, \text{cm}^2 $$