#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cout<<"a=";cin>>a;
cout<<"b=";cin>>b;
cout<<"c=";cin>>c;
if((a<b+c)&&(b<a+c)&&(c<b+a)){cout<<"Formeaza triunghi";
if((a==b)&&(b==c))cout<<":echilateral";
else if(a==b || a==c || b==c)cout<<":isoscel";
if(a*a+b*b==c*c || b*b+c*c==a*a || a*a+c*c==b*b)cout<<":dreptunghic";}
else cout<<"Nu formeaza triunghi";
}
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