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17 lines
451 B
C++
17 lines
451 B
C++
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#include<stdio.h>
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#include<math.h>
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#include<iostream>
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using namespace std;
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int main()
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{
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double a,b,c,m,n,l,v;
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while(scanf("%lf%lf%lf%lf%lf%lf", &a, &c, &b, &n, &l, &m)!=EOF)
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{
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v=(double)sqrt((4.0*a*a*b*b*c*c-a*a*(b*b+c*c-m*m)*(b*b+c*c-m*m)-
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b*b*(c*c+a*a-n*n)*(c*c+a*a-n*n)-c*c*(a*a+b*b-l*l)*
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(a*a+b*b-l*l)+(a*a+b*b-l*l)*(b*b+c*c-m*m)*(c*c+a*a-n*n)))/12.0;
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printf("%.4lf\n", v);
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}
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return 0;
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}
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