The formula of sector area is a mathematical formula for calculating sector area. Its basic principle is to calculate that the area of a sector is proportional to the area of the whole circle. The specific formula is: sector area = (central angle /360)×π× radius 2. Here, the central angle is the angle of the sector in degrees, π is pi, and the radius is the radius of the circle where the sector is located.

In addition, if the arc length of the sector is known, the area can also be calculated by the arc length and radius, and the formula is: sector area = (arc length × radius) /2.