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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct Point {
  5.     double x, y;
  6. };
  7.  
  8. double dist(Point A, Point B) {
  9.     return sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y));
  10. }
  11.  
  12. double Area(Point A, Point B, Point C) {
  13.     double a = dist(A, B);
  14.     double b = dist(A, C);
  15.     double c = dist(B, C);
  16.     double p = (a + b + c) / 2;
  17.     return sqrt(p * (p - a) * (p - b) * (p - c));
  18. }
  19.  
  20. double getR(Point A, Point B, Point C) {
  21.     double a = dist(A, B);
  22.     double b = dist(A, C);
  23.     double c = dist(B, C);
  24.     return (a * b * c) / 4 * Area(A, B, C);
  25. }
  26.  
  27. int main() {
  28.     Point A, B, C;
  29.     cin >> A.x >> A.y >> B.x >> B.y >> C.x >> C.y;
  30.     cout << setprecision(2) << fixed << Area(A, B, C) << '\n';
  31.     cout << setprecision(2) << fixed << getR(A, B, C);
  32. }
  33.  
Success #stdin #stdout 0s 5272KB
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https://ideone.com/dLMZri
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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