Acdream 1065 同心树(数学)
2014-07-11 11:33
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用数学方法计算。
#include<cstdio> #include<cmath> #include<algorithm> #define pi 3.141592653589793 using namespace std; int main() { int t,l,a; double h,s,p; scanf("%d",&t); while(t--){ scanf("%d%d",&l,&a); while(a>90) a-=90; s=l*l; h=(sqrt(2.0)*sin((135.0-a)*2*pi/360.0)-1)*l/2; p=sqrt(2.0)*l/(4*sin((90-a/2.0)*pi/180.0)*sin((135-a/2.0)*pi/180.0)); p=p*h*2; s=s-p; printf("%.2lf\n",s); } return 0; }
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