To find volume $ V $ use formula:
$$ V = \dfrac{ \sqrt{ 3 } \cdot a ^{ 2 } \cdot l }{ 2 } $$After substituting $ a = 32.5 $ and $ l = 31 $ we have:
$$ V =\dfrac{ \sqrt{ 3 } \cdot 32.5 ^{ 2 } \cdot 31 }{ 2 } $$$$ V = \dfrac{ 1829.4787 \cdot 31 }{ 2 }$$$$ V = \dfrac{ 56713.8386 }{ 2 } $$$$ V = 28356.9193 $$