18 lines
450 B
C++
18 lines
450 B
C++
#include<stdio.h>
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#include<math.h>
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#define Pi 3.141592653
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int main()
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{
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int t;
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scanf("%d",&t);
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while(t--)
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{
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double x1,y1,x2,y2;
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scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
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double ans=0;
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ans=acos( ((x1*x1 + y1*y1 + x2*x2 + y2*y2- (x1-x2)*(x1-x2) - (y1-y2)*(y1-y2) )/(2* sqrt(x1*x1 + y1*y1) * sqrt(x2*x2 + y2*y2) )))*180/Pi;
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printf("%.2lf\n",ans);
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}
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return 0;
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}
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