3ft by 4ft
3x5x4 = 60 cubic feet
1.219 x 0.9144 = 1.11 square meters
6' x 4' x 3' = 72 cubic feet = 22/3 cubic yards
yes.
None now but there once was 2*4*3 = 24 cubic feet
66 square feet
A square yard is 3ft by 3ft
The pad has a volume of 4.67 cubic feet.
538 gallons
You cannot define a volume with only two linear dimensions.
A yard of dirt is 3ft x 3ft x 3ft, or 27 cubic ft. The hole you need to fill is 8ft x 4ft x 1ft, or 32 cubic ft. You'll need 32/27th yards of dirt, or about 1.19 yards of dirt. Call it a yard and a half if you want to account for settling.