1045.c

#include <stdio.h>

int main()
{
    double A, B, C;

    scanf("%lf %lf %lf", &A, &B, &C);

    if(A >= B+C || B >= A+C || C >= A+B){
     printf("NAO FORMA TRIANGULO\n");
    }
    else{
		if(A*A== B*B + C*C || B*B== A*A + C*C || C*C== A*A + B*B){
		 printf("TRIANGULO RETANGULO\n");
		}
		else if(A*A > B*B + C*C || B*B > A*A + C*C || C*C> A*A + B*B){
		 printf("TRIANGULO OBTUSANGULO\n");
		}
		else if(A*A < B*B + C*C && B*B< A*A + C*C && C*C< A*A + B*B){
		 printf("TRIANGULO ACUTANGULO\n");}
    }



    if(A == B && A == C){
     printf("TRIANGULO EQUILATERO\n");
    }
    else if(A == B && C != A || B == C && A != B || C == A && B != C){
     printf("TRIANGULO ISOSCELES\n");
    }


    return 0;
}