1. Prepare a square piece of paper.

2. Fold diagonally.

3, triangle down, fold one side.

4. Fold the remaining corners.

5. Fold down to the bottom.

6. Instead, open it and fold it along the crease.

7. Fold along the edge.

8. Fold the extra edges around the triangle.

9. The extra corner is plugged into the crack.

10, and in this way, the corner of the dart is completed.

1 1, according to the above method, and then fold two identical ones.

12. Insert the thin edge into the hypotenuse in turn.

13, plug it all and it's over.

The role of darts:

Hunting: In primitive society, darts were one of the important hunting tools. Hunters catch prey such as deer and wild boar by throwing darts. Darts are still widely used for hunting in some areas.

2. Military use: In wartime, darts can be used as weapons to defend themselves or attack the enemy. For example, during World War II, the US military used darts as one of its weapons, called flying knives.

3. Sports: Dart has become a global sport. In the darts competition, players need to throw darts and hit the target as accurately as possible. Darts not only exercise the coordination and accuracy of the body, but also help to cultivate concentration and reduce stress.

4. Building and woodworking tools: In some cultures, darts are used as building tools or woodworking tools. For example, when building a house, darts can be used to fix rafters or other structural elements. In carpentry, darts can be used to sharpen stakes or adjust the shape and size of boards.

5. Medical treatment and first aid: In some areas, darts are used as medical tools or first aid tools. For example, in an emergency, darts can be used to pierce or puncture the skin to release pus or blood. In addition, some types of darts can also be used to pull out nails or remove thorns from the skin.

6. Toys and entertainment: Among children's toys and entertainment, darts are one of the most popular choices. Children like throwing darts and watching them fly and land in the air. In addition, many bars and entertainment places also provide darts games as entertainment activities.

7. Send a distress signal: In the wild or in an emergency, if someone needs to send a distress signal, they can throw darts into the sky for others to see and attract attention.

8. Measuring distance: In some cases, darts can be used to measure distance. For example, in hunting or reconnaissance activities, hunters or scouts can measure the distance from the target with darts in order to aim at the target more accurately.

9. Signaling: In some cultures, darts are used as signaling tools. For example, in marine culture, sailors can use darts to communicate with other ships or locate them.