The center of the circle is located at a certain point, and the sizes of the two paths can be calculated.
There are countless diameters and radii, and the line segments on the central circle are connected.
The relationship between the two is conditional, and the circle comes first.
The diameter is the radius of the brother, and the brother is twice as short as the brother.
Drawing a circle with compasses is very simple, and the radius is between your feet.
The needle tip is fixed at the center of the circle, and the refill is completed in one turn.