Question 1195853
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For this special case,  use the formula for the volume of cylindrical wedge


        V = {{{(2/3)*r^3*tan(angle)}}} = {{{(2/3)*3^3*1}}} = 2*9 = 18 m^3.



On the formula,  see the link

https://mathworld.wolfram.com/CylindricalWedge.html