To find diagonal $ d2 $ use formula:
$$ A = \dfrac{ d_1 \cdot d_2 }{ 2 } $$After substituting $A = 156\, \text{cm}$ and $d_1 = 24\, \text{cm}$ we have:
$$ 156\, \text{cm} = \dfrac{ 24\, \text{cm} \cdot d_2 }{ 2 } $$$$ 156\, \text{cm} \cdot 2 = 24\, \text{cm} \cdot d_2 $$$$ 312\, \text{cm} = 24\, \text{cm} \cdot d_2 $$$$ d_2 = \dfrac{ 312\, \text{cm} }{ 24\, \text{cm} } $$$$ d_2 = 13 $$