C++ 实现：根据三点坐标求三角形周长（附代码与详细题解）

```cpp #include <iostream> #include <iomanip> #include <cmath> using namespace std; struct Point { double x, y; }; double distance(Point a, Point b) { return sqrt(pow(a.x - b.x, 2) + pow(a.y - b.y, 2)); } int main() { Point p1, p2, p3; cin >> p1.x >> p1.y; cin >> p2.x >> p2.y; cin >> p3.x >> p3.y; double d1 = distance(p1, p2); double d2 = distance(p2, p3); double d3 = distance(p3, p1); double perimeter = d1 + d2 + d3; cout << fixed << setprecision(2) << perimeter << endl; return 0; } ``` ######[AI问答 | 190点数解答 | 2025-12-16 12:26:50]