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Stage: 3 and 4 Challenge Level: 
Start with cylindrical hats.
How could you make a cylinder? Try cutting and unfolding a cylindrical container to see how it's made.
Now explore conical hats.
Roll up a piece of paper and cut it to make a cone, then unroll it. What do you notice?
How could you make a cylinder? Try cutting and unfolding a cylindrical container to see how it's made.
Now explore conical hats.
Roll up a piece of paper and cut it to make a cone, then unroll it. What do you notice?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.