C++建立正四面体类,计算边长为a的正四面体的体积、表面积

//上面那位是正方体,不是正四面体
#include
#include
using namespace std;
class CRegulartetrahedron
{
public:
CRegulartetrahedron():edge(0),height(0){}
CRegulartetrahedron(double x):edge(x)
{
height=sqrt(6.0)/3.0*edge;
}
double GetVolume()//体积
{
return 1.0/2.0*edge*sqrt(3.0)/2.0*edge*height*1.0/3.0;//底面积乘以高除以三分之一
}
double GetSuperficialArea()//表面积
{
return 4.0*1.0/2.0*edge*sqrt(3.0)/2.0*edge;//四个面积之和
}
private:
double edge;//边长
double height;
};
void main()
{
CRegulartetrahedron RT(2);
cout