After separating the seven pieces of the jigsaw puzzle, we can find that the jigsaw puzzle is composed of equilateral triangles, parallelograms and squares, instead of seven kinds of figures. The triangles in the jigsaw puzzle are equilateral triangles, although they are different in size.
Tangram is an intellectual toy, suitable for children aged 3~6. However, many adults also like to play jigsaw puzzles. Because jigsaw puzzles are so powerful.
Tangram is an ancient traditional intellectual toy in China. As the name implies, it consists of seven boards. These seven boards can be combined into many figures (1600), such as triangles, parallelograms, irregular polygons, etc. Players can also combine them into various characters, images, animals, bridges, houses, towers, etc., or some Chinese and English letters.
Tangram was invented by the working people in ancient China, and its history can be traced back to at least the first century BC, and it was basically finalized in the Ming Dynasty. Ming and Qing Dynasties were widely circulated among the people in China. Qing people wrote in Volume I of Cold Records Miscellaneous Knowledge: There are seven ingenious pictures with five shapes and seven numbers recently, and there are thousands of changes.
Things are small in shape, changing at will, and full of games, which are enough to relieve boredom and break the silence, so secular people like them. /kloc-in the 0/8th century, the jigsaw puzzle spread abroad. Needham said it was one of the oldest pastimes in the East, and the library of Cambridge University in England also collected "seven ingenious new music".