#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int read()
{
    char c=0;
    int sum=0;
    while (c<'0'||c>'9') c=getchar();
    while ('0'<=c&&c<='9') sum=sum*10+c-'0',c=getchar();
    return sum;
}
int T;
const double Pi=asin(1)*2;
double l1,l2,l3,l4,l5,l6,a,b,c,d;
int main()
{
    T=read();
    while (T--)
    {
	l1=read(),l2=read(),a=read()/180.0*Pi,b=read()/180.0*Pi;
	if (b<=Pi/2) printf("%0.20lf\n",(l1+l2)*(l1+l2)*a+l2*l2*b);
	else
	{
	    l3=l1*sin(Pi-b),l4=l1*cos(Pi-b);
	    if (l4<=l2)
	    {
		if (b-Pi/2<=2*a) printf("%0.20lf\n",(l1+l2)*(l1+l2)*a+l2*l2*b+l3*l4-l3*l3*(b-Pi/2));
		else c=b-Pi/2-2*a,l5=l3*tan(c),printf("%0.20lf\n",(l1+l2)*(l1+l2)*a+l2*l2*b+l3*l4-l3*l3*(2*a)-l3*l5);
	    }
	    else
	    {
		l5=sqrt(l1*l1+l2*l2-2*l1*l2*cos(Pi-b)),c=asin(sin(Pi-b)/l5*l2);
		if (c<=2*a) printf("%0.20lf\n",(l1+l2)*(l1+l2)*a+l2*l2*b+l1*l2*sin(Pi-b)-l5*l5*c);
		else d=c-2*a,l6=l5*tan(d),printf("%0.20lf\n",(l1+l2)*(l1+l2)*a+l2*l2*b+l1*l2*sin(Pi-b)-l5*l5*(2*a)-l5*l6);
	    }
	}
    }
    return 0;
}