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orz_qbl    Created at    1 likes

We can define pi as 3.14. Radius: r. Perimeter Formula: 2 * pi * r. Area formula: pi * r * r. Example Code (C++) ```cpp #include <bits/stdc++.h> #define pi 3.14 double r; using namespace std; int main(){ cin >> r; cout << fixed << setprecision(3) << 2*pi*r << " " << pi*r*r << endl; return 0; } ```