发布时间 ： 2021-01-26 06:28:53 UTC
类别 ： Geometric
Page Views: 12 views
\(S=(1/2)nR^2*sinα=nr^2tan（α/2)\)
In the formula,
N--number of sides,
R--the radius of the circumscribed circle,
R--the radius of the inscribed circle of the triangle,
Α--the angle of the center of the circle (in degrees)