Tangram consists of three kinds of figures, including five isosceles right triangles (two small triangles, one middle triangle and two large triangles), a square and a parallelogram.

Tangram is an ancient traditional intellectual toy in China. As the name implies, it consists of seven wooden boards, and the complete pattern is a square: five isosceles right triangles (two small triangles, one middle triangle and two large triangles), one square and one parallelogram. 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 1 of Miscellaneous Knowledge in Lenglu: Recently, there are seven ingenious pictures with five shapes and seven numbers, and there are thousands of variations. 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 that it is one of the oldest pastimes in the East. Up to now, the library of Cambridge University in England still has seven ingenious chess pieces.

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