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13 lines
209 B
13 lines
209 B
2 years ago
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#include <bits/stdc++.h>
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using namespace std;
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const double PI = 3.14159;
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int main() {
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double r;
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cin >> r;
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printf("%.4lf %.4lf %.4lf", 2 * r, 2 * PI * r, PI * r * r);
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return 0;
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}
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