If you have a fish pond and it is 3 feet deep 4 wide 6 long How of liner do need?

The surface area of the bottom of the pond is 4 × 6 = 24 square feet. The surface area of the sides of the pond is 2 × (4 + 6) × 3 = 60 square feet. The total surface area that needs to be covered by liner is 24 + 60 = 84 square feet.