Compasses can only be used in the sixth grade of primary school. Compass is a tool for drawing circles or strings in mathematics and drawing, and is often used for drawing with a ruler. Compasses are made of metal and plastic, including two parts connected by hinges, which can be adjusted.

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Primary school is a school where people receive primary formal education and an important part of basic education. With the development of society, kindergartens have opened in front of it. Generally, children aged 6- 12 are of primary school age, and the length of primary school education at this stage is 6 years (or 5 years in a few places). The primary education stage is followed by the secondary education stage.

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A compass consists of a pen tip, a rotating shaft, compass legs, a ruler, a hinge, a pen body, a pen tip, a compass tip and small ears, wherein the lower end of the pen tip is inserted into the upper end of the pen body, and the lower end of the pen body is in threaded connection with the upper end of the pen tip; the flush end of the small ear is welded in the middle of the outer side of the compass leg, and the lower end of the compass leg is clamped with the upper end of the compass tip. Characterized in that one side of the pen body is bonded to one side of the hinge, and the other side of the hinge is bonded to the middle of one end of the ruler; Inserts on both sides of the upper end of the seam of the pen body are located at both ends of the rotating shaft, and the shaft body of the rotating shaft is connected to the upper end of the compass leg through a sleeve.

The Method of Pupils Using Compasses

Compass: First, make sure there is a suitable compass, which should be an adjustable compass, generally with fixed feet and movable feet.

Adjust the compass.

Open the compass: separate your feet and open the compass.

Adjust radius: adjust the position of movable feet according to the radius of the circle to be drawn. Move the movable foot to a suitable position so that the distance between the two feet is equal to the required radius.

Fix compasses: after ensuring that the movable feet are in the correct position, tighten the fixing nuts to fix the radius of compasses.

Draw a circle: Now, you can put one foot of the compass on the center point on the drawing paper, and then draw a circle around the center point with the other foot as the fulcrum. Please be careful not to slide the compass to ensure that the circle drawn is accurate.

Finish drawing: After drawing the circle, loosen the fixed nut, retract the movable foot, and then close the compasses.

Check the circle: check whether the drawn circle meets the requirements and make necessary corrections if necessary.