- Snapshots of modern mathematics
- Diderot Mathematical Forum 2013: “Mathematics of Planet Earth”
- Pierre de Fermat and Andrew Wiles in Czech Republic stamps
- Stefan Banach (March 30, 1892 – August 8, 1945)
- Diderot Mathematical Forums
- Guessing the Numbers
- What is mathematics for Ehrhard Behrends
- What is mathematics for Krzysztof Ciesielski
- The Three Ducks Trick
- What is mathematics for Franka Brueckler

# Christmas maths activity: Make your own Christmas tree

**A Christmas tree has roughly a conical shape. Consequently, it is quite easy to make a decoration in the form of a Christmas tree from cardboard or other suitable material.**

*by Franka Miriam Brueckler*

The surface of the cone laid flat is a circular sector, so all you need to do is to draw a circular sector on the cardboard, cut it out, decorate it and glue it into a conical form using adhesive tape. Better still, you can also start thinking and calculate the right size and angle for your circular sector if you want to obtain a Christmas tree of a specific height and width!

Another nice decoration in the form of a Christmas tree is also of mathematical nature. You draw a spiral on cardboard, decorate it, cut it out and hang it at the center. Basically any kind of spiral will do: an Archimedean one, a Fibonacci one, a simple made of half circle arcs, …

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