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A millilitre is one cubic centimetre.
Check that you can calculate the volume of a cylinder.
If the diameter is 6 cm, you can calculate the base area of the can.
If you know the base area you can find a height which will give you a specific volume ( 330 ml in this case)
Now start with a height (10 cm) and work your way back to a base area for a specified volume, then find a radius for that base area, and hence a diameter for the can.
What does least aluminium require ?
The top and base of the can are circles but how do you calculate the curved surface area ?