Dimensions:
Prism A:
Length = 4 ft ; Width = 2 ft ; Height = 4 ft
Prism B:
Length = 4 ft ; Width = 6 ft - 2 ft = 4ft ; Height = 2 ft
Volume = Length * Width * Height
V Prism A = 4ft * 2ft * 4ft = 32 ft³
V Prism B = 4ft * 4ft * 2ft = 32 ft³
Volume of the L shaped figure = V Prism A + V Prism B
V of L = 32 ft³ + 32 ft³
V of L = 64 ft³