STEP 1: find side $ a $
To find side $ a $ use formula:
After substituting $B = 65\, \text{cm}$ we have:
$$ B = a^2 $$ $$ a^2 = 65\, \text{cm} $$ $$ a = \sqrt{ 65\, \text{cm} } $$STEP 2: find volume $ V $
To find volume $ V $ use formula:
$$ V = \dfrac{ a ^{ 2 } \cdot h }{ 3 } $$After substituting $a = \sqrt{ 65 }\, \text{cm}^0$ and $h = 24\, \text{cm}$ we have:
$$ V = \dfrac{ 65 \cdot 24\, \text{cm} }{ 3 }$$$$ V = \dfrac{ 1560\, \text{cm} }{ 3 } $$$$ V = 520\, \text{cm} $$