The best spelling is square. Open a box of puzzles and you will see a square. Remember this position.
3. Divide the square into two right-angled triangles, the triangle composed of five pieces remains unchanged, and the changes of the other three figures are all completed by the parts composed of these two large triangles.
4. First of all, the big triangle: the right triangle composed of two triangles is aligned with one right side of the right triangle composed of five small figures, and it becomes a big triangle.
5. Next, align the other right-angled side of the right-angled triangle composed of two triangles with one right-angled side of the right-angled triangle composed of five small figures to form a parallelogram.
Tangram for expanding information is an ancient invention of China, and its history can be traced back to the ancient book Parallel Calculation of Classics in Weeks in BC 1 century. In the Palace Museum in Beijing, you can also see a puzzle in a copper box.
There is also a saying that the ingenious idea of Tangram comes from a kind of furniture in ancient China: a set of seven tables. When there are many guests, you can assemble a set of seven pieces, and you can display ancient books separately at ordinary times.
/kloc-Around the 8th century, Tangram was introduced to foreign countries, meaning "jigsaw puzzle from China". According to legend, Napoleon used jigsaw puzzles as a pastime when he was in exile. At that time, the grand occasion of Tangram was roughly the same as that of Lego, which is now popular all over the world. Even now, when you go abroad, your love for Tangram can be seen everywhere.