33 lines
641 B
C++
33 lines
641 B
C++
#include<cstdio>
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#include<algorithm>
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#include<iostream>
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#include<cstring>
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#include<cmath>
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using namespace std;
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double a,b,c;
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int main() {
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int t;
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cin>>t;
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while(t--) {
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scanf("%lf%lf%lf",&a,&b,&c);
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if(b<c)
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swap(b,c);
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double x=b/2;
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double y=c/2;
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double r=sqrt(2*a*a);
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double ans;
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if(r<y) {
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ans=a*a;
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} else {
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if(y<r/2) {
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ans=y*y;
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} else {
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double z=r-y;
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ans=a*a-z*z;
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}
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}
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printf("%.4f\n",ans);
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}
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return 0;
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}
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