To find area $ A $ use formula:
$$ A = \dfrac{ d_1 \cdot d_2 }{ 2 } $$After substituting $d_1 = 0.8\, \text{cm}$ and $d_2 = 2.5\, \text{cm}$ we have:
$$ A = \dfrac{ 0.8\, \text{cm} \cdot 2.5\, \text{cm} }{ 2 }$$$$ A = \dfrac{ 2\, \text{cm}^2 }{ 2 } $$$$ A = 1\, \text{cm}^2 $$