baoshuo/OI-codes
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604. 圆的面积

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https://www.acwing.com/problem/content/submission/code_detail/7741979/
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Baoshuo Ren 2021-09-15 19:46:31 +08:00 committed by Baoshuo Ren
parent 86539a48c3
commit c10aad441a
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 12 additions and 0 deletions
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AcWing/604/604.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
const double pi = 3.14159;
int main() {
double r;
cin >> r;
cout << "A=" << fixed << setprecision(4) << pi * r * r << endl;
return 0;
}