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The width of the A4 sheet could determine the circumference of the base of the cylinder. Then the diameter of the base restricts how high the cylinder can be - can you work out the dimensions of this cylinder?

The length of the A4 sheet could determine the circumference of the base of the cylinder.

The width of the A4 sheet could determine the height of the cylinder.

The length of the A4 sheet could determine the height of the cylinder.