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ac了，发贴庆祝。。谢大虾们。。。In Reply To:我知道了，是4。54， 刚才2*pi-a也改了---但还wa ：。（，高手们再看看。。 Posted by:fjnu_jxd_010 at 2005-07-28 15:57:52 > #include<iostream>
> #include<iomanip>
> #include<cmath>
> using namespace std;
> int main()
> {
> double r, h, d1, a1,d2,a2,pi=3.1415926535898,R,w,ld,sha,dm,da,h1,slo,a;//
> while(cin>>r>>h>>d1>>a1>>d2>>a2)
> { if(fabs(a1-a2)==0||fabs(a1-a2)==360)
> slo=fabs(d1-d2);
> else
> {
>
> a1=a1/360.0*2.0*pi;
> a2=a2/360.0*2*pi;
> R=sqrt(r*r+h*h);
> a=fabs(a1-a2);
>
> // else
> // {
> if(d1>d2)
> { da=d1;dm=d2;}
>
> else
> {da=d2;dm=d1;}
>
>
> if(a>pi)
> a=2*pi-a;
> w=2.0*pi*r/R*a/(2*pi);
> sha=sin(w)*d1*d2;
> h1=sha/da;
> ld=sqrt(dm*dm-h1*h1);
> slo=sqrt(h1*h1+(da-ld)*(da-ld));
> }
> cout<<fixed<<setprecision(2)<<slo<<endl;
> }
>
>
> return 0;
> }
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