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- #include <iostream>
- #include<bits/stdc++.h>
- #define ll long long
- #define ull unsigned long long
- #define pi 3.14159
- using namespace std;
- int main() {
- ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
- double a,ab;
- cin>>a>>ab;
- long double r = sqrt(a/pi);
- long double x2= pow((4*r),2);
- double x= sqrt(x2/2); cout<<x;
- /*double area = (1/2)*(1/2)*x*ab;
- cout<<area;*/
- /*long double x= (sqrt(8)*r)/2;
- long double y = (1/2)*((1/2)*x*ab);
- cout<<y;*/
- return 0;
- }
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