A is measured from the bottom of the rim to the base of the liner.
B and C measurements are taken one inch down from beneath the lip on the outside of the liner.
D and E measurements are taken three inches up from the bottom on the outside of the liner. This eliminates distortion due to the radius of the corners.
NOTE: All dimensions shown refer to the OUTSIDE of the liner, or INSIDE of the bucket. All measurements are rounded to the nearest half inch.