1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
|
#include <cmath> using namespace std; double a, b, L, R; void (){ scanf("%lf%lf%lf%lf", &a, &b, &L, &R); } double FF(double x){ return b * (x * sqrt(a * a - x * x) / 2 + a * a * asin(x / a) / 2) / a; } void solve(){ if(L < -a) L = -a; if(R > a) R = a; printf("%.3lfn", (FF(R) - FF(L)) * 2); } int main(){ int T; scanf("%d", &T); while(T--){ init(); solve(); } return 0; }
|
近期评论