19 lines
519 B
C++
19 lines
519 B
C++
#include<stdio.h>
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#include<math.h>
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int main()
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{
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int T;
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double x1, x2, x3, y1, y2, y3, a, b, c, s;
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scanf("%d",&T);
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while(T--)
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{
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scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3);
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a = ((y2-y1)*(x3-x2)/(x2-x1)-(y3-y2))/((x2*x2-x1*x1)*(x3-x2)/(x2-x1)-(x3*x3-x2*x2));
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b = ((y2-y1)-a*(x2*x2-x1*x1))/(x2-x1);
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c = y1-a*x1*x1-b*x1;
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s = (a/3*x3*x3*x3+b/2*x3*x3+c*x3)-(a/3*x2*x2*x2+b*x2*x2/2+c*x2)-(y3+y2)*(x3-x2)/2;
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printf("%.2lf\n",s);
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}
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return 0;
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}
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