Tools/raw materials

tangram

Methods/steps

1 put a circle first.

Then on the right side of the circle, two semicircles are placed side by side as the mermaid's long hair.

Put a curved plate directly under the circle, and the arc is on the left.

Then, under the curved plate, put the center plate aside, and the right-angle notch is on the right.

Then, on the right side of the center plate, put the trapezoid aside and put the upper ends together.

Finally, put a triangle on the lower right side of the trapezoid, with the right angle on the left, as shown in the figure. Mermaids are put together like this.

tangram

It 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 1 of Miscellaneous Knowledge in Lenglu: Recently, there are seven ingenious pictures with five shapes and seven numbers, 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".