该程序实现了对三角形的计算，包括面积周长，圆心角等，并通过一些参数的设置反算出三角形的某些值，使用MFC编写的界面-The reform program of the calculation of the triangle, including the area of ​ ​ the perimeter, central angle, anti-calculated some values ​ ​ of the triangle and set some