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Witch's Hat

Stage: 3 and 4 Challenge Level: Challenge Level:1
Thanks to Cubes, Aisling and Brandon for their ideas on how to make a wizard's hat or a witch's hat.  Cubes suggested cutting out two triangles and sticking them together.  Aisling and Brandon both suggested rolling a piece of paper into a cone.

Either of these methods would work to make a pointy hat.  

But there is a better way to make a conical hat.

What do you think?
 
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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