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13 lines
204 B
C++
13 lines
204 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const double pi = 3.14159265358979323;
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int main() {
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int r;
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scanf("%d", &r);
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printf("%.6lf\n%.6lf\n", r * r * pi, r * r * 2.0);
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return 0;
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}
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