1. Make a circle with a fixed length r as the radius, pass through the center o, and make two vertical diameters Mn MN, HP.

2. Make a ray NS after N points, divide it into seven equal parts, connect it with MS, then make a parallel line of MS after NS points, and divide MN into seven equal parts.

3. Draw a circle with M as the center and MN as the radius. The HP extension line intersects at point K, from point K to even or odd points (such as 1, 3, 5, 7) of all bisectors on MN, and the rays intersect at points A, B, C and M, and then take AB, BC and CM as the side length, at point A (or point M).

The following is the introduction of a regular polygon inscribed in a circle:

A regular polygon inscribed in a circle refers to a regular polygon whose vertices are all on the same circumference.

The inscribed regular polygon of a circle is an important regular polygon. A regular polygon whose vertices are all on the same circle. A regular polygon is always inscribed with a circle, so it is called the inscribed circle of a regular polygon and the circle is called the circumscribed circle of a regular polygon. So you can get a regular polygon by dividing a circle into n(n)3) equal parts.

Connect these points in turn to get the inscribed regular N-polygon of the circle. This circle is called the circumscribed circle of this regular N-polygon. When the number of sides n increases, the perimeter of the inscribed and circumscribed regular n polygons of the circle is close to the perimeter of the circle, and their areas are close to the area of the circle. Ancient mathematicians in Greece and China have experienced this idea which accords with the modern limit theory, and they all calculated the approximate value of pi from it.

For the above information, please refer to Baidu Encyclopedia-Regular Polygon inscribed in a circle.