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minimum surface Area for a volume of 900cm3 my results were:
• Cylinder – 516.0315049 cm3
• Sphere - 450.7950419 cm3
• Cube - 559.3018511 cm3
So from these results I can see that as I previously stated the sphere is the best 3-D shape to store any volume water because it has the smallest surface area. However the manufacturing company has chosen the cylinder because although a sphere has a smaller surface area it would be very difficult to stack on supermarket shelves and store safely, whereas a cylinder can be kept upright.