Tangram

One of the main activities during Mathematics Society is playing with various dissection puzzles--- from the common tangrams to similar puzzles but consisting of twelve, nine or four pieces. In addition to just playing, we also try to find out mathematics-related theories behind these puzzles. For example, we use the lengths of each side of the different pieces and the area of the puzzle to figure out what are the possible shapes created--- see the pictures below if you want to know how!
And this essentially is the theme of the club--- learning mathematics through interesting, relaxing activities.

The mathematics theory hidden behind tangram

Finding what shapes are possible to be formed by tangrams--- through mathematics and calculation!

Usually tangrams have seven pieces but there are variants, which includes four pieces ones (the white part shows the net);

---And even 12 pieces!