#pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include<bits/stdc++.h>
// #include<atcoder/all>
#define FR(i,n) for(int i=0;i<n;++i)
#define eb emplace_back
#define st first
#define nd second
#define x1 fxxkcjb
#define y1 fxxkyzc
#define x2 fxxkzzy
#define y2 fxxknitit
using namespace std;
namespace R=ranges;
template<typename T>
using func=function<T>;
template<typename T>
using vec=vector<T>;
using ll=long long;
using ld=long double;
using i128=__int128;
using pii=pair<int,int>;
const ll inf=ll(1e18)+7;
const ld eps=1e-12,PI=acos(-1);
int sgn(ld x){return x<-eps?-1:x>eps;}
struct P{
    ld x,y;
    P operator+(P p){return {x+p.x,y+p.y};}
    P operator-(P p){return {x-p.x,y-p.y};}
    P operator*(ld c){return {x*c,y*c};}
    ld operator*(P p){return x*p.y-y*p.x;}
    ld dis(){return hypot(x,y);}
    P rot90(){return {-y,x};}
    P norm(){
        assert(sgn(dis())>0);
        return (*this)*(1/dis());
    }
};
struct L3D{
    P s,t;
    ld zs,zt;
};
void sol(){
    int n,m;cin>>n>>m;
    vector a(n,vector<P>());
    FR(i,n){
        int ni;cin>>ni;
        a[i].assign(ni,{0,0});
        FR(j,ni)cin>>a[i][j].x>>a[i][j].y;
    }
    vector<L3D>b(m);
    for(L3D&l:b){
        cin>>l.s.x>>l.s.y>>l.zs;
        cin>>l.t.x>>l.t.y>>l.zt;
    }
        ld l=0,r=4e6;
    {
        FR(tim,256){
            ld mid=(l+r)/2;
            vector<int>in(n,0);
            for(L3D l:b){
                P dir=(l.t-l.s).rot90().norm();
                vector<P>poly{l.s+dir*l.zs*mid,l.s-dir*l.zs*mid,l.t-dir*l.zt*mid,l.t+dir*l.zt*mid};
                FR(i,n){
                    if([&](){
                        for(P p:a[i])
                            FR(j,4)if(sgn((poly[j]-p)*(poly[(j+1)%4]-p))<0)return 0;
                        return 1;
                    }())in[i]=1;
                }
            }
            bool fg=1;
            FR(i,n)fg&=in[i];
            if(fg)r=mid;else l=mid;
        }
    }
    if(r>3e6)cout<<"impossible\n";
    else cout<<fixed<<setprecision(15)<<atan(r)*180/PI<<"\n";
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    sol();
    return 0;
}
/*
3 2
3
20 30
50 50
10 50
4
40 20
60 10
75 20
60 30
4
45 60
55 55
60 60
55 65
0 30 20 78 70 5
55 0 20 70 60 10
*/