Pick any point and do it with a compass! Just like the picture below.

Select a point first, and you can draw a circle with a compass. But it should be noted that the radius of the circle you draw should match the distance between points. Once the distance is short or the side of the circle is long, it won't stick. This needs attention.

Extended data:

In a plane, a closed curve formed by a moving point rotating around a certain point with a certain length is called a circle. A circle has countless axes of symmetry.

On the same plane, the set of points whose distance to a fixed point is equal to a fixed length is called a circle. A circle can be expressed as a set {m |||| mo | = r}, where o is the center of the circle and r is the radius. The standard equation of a circle is (x-a)? + (y - b)？ = r？ Where point (a, b) is the center of the circle and r is the radius.

A circle is a geometric figure. By definition, compasses are usually used to draw circles. The diameter and radius of the inner circle of the same circle are always the same, and the circle has countless radii and diameters. A circle is a figure with axial symmetry and central symmetry. The axis of symmetry is the straight line where the diameter lies. At the same time, the circle is a "positive infinite polygon" and "infinity" is just a concept.

The more sides a polygon has, the closer its shape, perimeter and area are to a circle. So there is no real circle in the world, and the circle is actually just a conceptual figure.

Baidu Encyclopedia-Ark: Circle