Ответы на вопрос:
#include < iostream> #include < iomanip #include < cmath> using namespace std; double st(double x1, double y1, double x2, double y2) { return sqrt((y2-y1)*(y2-y1)+(x2-x1)*(x2-x1)); } double per(double a, double b, double c) { return a+b+c; } double s(double a, double b, double c) { double p2 = per(a,b,c)/2; return sqrt(p2*(p2-a)*(p2-b)*(p2-c)); } int main() { double x1, y1, x2, y2, x3, y3; double a, b, c, p, s; cin > > x1 > > y1; cin > > x2 > > y2; cin > > x3 > > y3; a = st(x1,y1,x2,y2); b = st(x1,y1,x3,y3); c = st(x2,y2,x3,y3); p = per(a,b,c); s = s(a,b,c); cout.setf(std: : ios: : fixed); cout.precision(6); cout < < "p = " < < p < < "\n"; cout < < "s = " < < s < < "\n"; system("pause"); return 0; } пример: 1 1 4 1 1 5 p = 12.000000 s = 6.000000
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