20. We need the area anyway. So I solve first 19

Area = pi*3^2/2+9*6+pi*3^2/2=9(pi+6) meters square

The volume (presumably the solid is going straight up from the base having the same cross-section as in 19 at any height)

Area*height = 9(pi+4)*8 = 72*(pi+6)=658.2 meters cube

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