What is a jigsaw puzzle?

Tangram, also known as Tangram and Wisdom Board, is a traditional educational toy in China, just like Lubansuo and Jiuhuanhuan. As the name implies, Tangram consists of seven wooden boards, which are five isosceles right triangles (two small triangles, one middle triangle and two large triangles), a square and a parallelogram. The complete pattern is a square.

Tangram evolved from Yan's pictures in the Song Dynasty and was designed by using the mathematical principle of "triangular shapes staggered". According to statistics, these seven blocks can be spliced into many figures, reaching more than 1600. Players can splice them into various figures, animals, bridges, houses, towers and so on. Or some Chinese and English letters or geometric figures.

Tangram was invented by working people in ancient China. It was widely circulated among the people in the Ming and Qing Dynasties, and spread abroad in the18th century. It can inspire children's intelligence, cultivate children's observation, imagination, shape analysis ability and creative logic, and also help children identify colors and understand geometric figures and basic mathematical concepts.