'commit'

TangDou/AoSaiYiBenTong/YBT1014.cpp

@@ -0,0 +1,12 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+const double PI = 3.14159;
+
+int main() {
+    double r;
+    cin >> r;
+    printf("%.4lf %.4lf %.4lf", 2 * r, 2 * PI * r, PI * r * r);
+    return 0;
+}