To find diagonal $ d1 $ use formula:
$$ A = \dfrac{ d_1 \cdot d_2 }{ 2 } $$After substituting $A = 0.06\, \text{cm}$ and $d_2 = 0.6\, \text{cm}$ we have:
$$ 0.06\, \text{cm} = \dfrac{ d_1 \cdot \left( 0.6\, \text{cm} \right)^{4} }{ 2 } $$$$ 0.06\, \text{cm} \cdot 2 = d_1 \cdot \left( 0.6\, \text{cm} \right)^{4} $$$$ 0.12\, \text{cm} = 0.6\, \text{cm} \cdot d_1 $$$$ d_1 = \dfrac{ 0.12\, \text{cm}}{ 0.6\, \text{cm} } $$$$ d_1 \approx 0.0637 $$