Through the area calculation on the sphere,ellipsoid and plane,this paper obtains the scope of solving the problem by using the plane replacing the ellipsoid and the applicability of calculating the area of the sphere.

• 通过在球面上、椭球面上及在平面上面积的计算,得出了采用平面代替椭球面来解决问题的范围以及在球面上计算面积的适用范围。