D - Круг

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unknown
c_cpp
2 years ago
225 B
9
Indexable
#include <bits/stdc++.h>

using namespace std;

int main() {
    double r;
    cin >> r;
    const double pi = 3.14;
    double area = pi * r * r;
    cout << fixed << setprecision(9) << area;
    return 0;
}


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