What is the formula of darts model?

The formula of darts model is a+b = e+f.

Darts/kloc-rose in Britain in the 0/5th century and became a necessary activity for people to relax in bars in the early 20th century. In 1930s, darts became more and more professional, and professional associations, professional competitions and a large number of professional masters appeared.

In the application of self-defense in ancient China, China has three kinds of darts.

The first one is willow-shaped, and his technique is roughly the same as flying knife, with 90-degree direct flight, 180-degree spiral flight, 360-degree spiral flight and so on.

The second kind is a dart with ears behind it, also called an ear dart.

The third kind of darts, as shown in figure 1, are called meteor darts, cross darts, four-star darts, square darts and blood moon darts in China, that is, Japanese shuriken Ninja darts.

Dart history:

The sport of darts has a long history, which originated in Britain in the15th century.

According to records, the soldiers of the Roman Legion were sent to the distant British island by the Roman emperor, and the rainy British climate made it inconvenient for them to stay outdoors for a long time. So, in the shed, they shot arrows at targets made of oak cross-sections, which gradually developed into modern darts.