三角形类锥形

#include <iostream>

#include<cmath>

using namespace std;

class Triangle

{

public:

void setABC(double x,double y,double z);

double perimeter();

double area();

private:

double a,b,c;

};

void Triangle::setABC(double x,double y,double z)

{

a=x;

b=y;

c=z;

}

double Triangle::perimeter()

{

return a+b+c;

}

double Triangle::area()

{

double n;

n=(1.0/2)*(a+b+c);

return sqrt(n*(n+a)*(n-b)*(n-c));

}

int main()

{

Triangle tri1;

tri1.setABC(4,5,6);

cout<<"周长："<<tri1.perimeter()<<'\t'<<"面积："<<tri1.area()<<endl;

return 0;

}