/* 簡(jiǎn)單的數(shù)學(xué)幾何題 */// include file #include <cstdio> #include <cstdlib> #include <cstring> #include <cmath> #include <cctype> #include <ctime>#include <iostream> #include <sstream> #include <fstream> #include <iomanip> #include <bitset>#include <algorithm> #include <string> #include <vector> #include <queue> #include <set> #include <list> #include <functional>using namespace std;// typedef typedef __int64 LL;// #define read freopen("in.txt","r",stdin) #define write freopen("out.txt","w",stdout)#define Z(a,b) ((a)<<(b)) #define Y(a,b) ((a)>>(b))const double eps = 1e-6; const double INFf = 1e100; const int INFi = 1000000000; const LL INFll = (LL)1<<62; const double Pi = acos(-1.0);template<class T> inline T sqr(T a){return a*a;} template<class T> inline T TMAX(T x,T y) {if(x>y) return x;return y; } template<class T> inline T TMIN(T x,T y) {if(x<y) return x;return y; } template<class T> inline T MMAX(T x,T y,T z) {return TMAX(TMAX(x,y),z); } template<class T> inline T MMIN(T x,T y,T z) {return TMIN(TMIN(x,y),z); } template<class T> inline void SWAP(T &x,T &y) {T t = x;x = y;y = t; }// code begin int T, N; double R,a,r; int main() {read;write;scanf("%d",&T);for(int i=1;i<=T;i++){scanf("%lf %d",&R,&N);a = (2*Pi)/N;a = sin(a/2);printf("Scenario #%d:\n",i);printf("%.3f\n\n",R*a/(1+a) );}return 0; }

轉(zhuǎn)載于:https://www.cnblogs.com/ac2012/archive/2011/04/28/2032190.html

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