For a simplified rectangular pond with vertical sides, the top opening is 5.5×3.75 m and depth 0.8 m. A one-piece liner must cross the bottom, both side depths and 0.4 m anchoring allowance beyond EACH edge. Ignore corner folds, seams and stretching when estimating rectangular purchase dimensions. Water is filled only to 0.6 m.
Calculate the rectangular liner purchase area in square metres. Keep intermediate values unrounded; round the final answer to 4 decimal places if needed.