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- #include<stdio.h>
- #include<math.h>
- #include<stdlib.h>
- int main()
- {
- int i;
- double a,b,c,d,s,h,j,n,Area;
- scanf("%lf",&n);
- for(i=1;i<=n;i++)
- {
- scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
- j=abs(c-a);
- s=(b+d+j)/2;
- h=abs(2*(sqrt(s*(s-j)*(s-b)*(s-d)))/j);
- Area=((a+c)/2)*h;
- printf("Case %d: %lf\n",i,Area);
- }
- }
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