1045.c

#include <stdio.h>

int main() {

    /**
     * Escreva a sua solução aqui
     * Code your solution here
     * Escriba su solución aquí
     */
 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");
    if((a == b && a != c)  || (a == c && a != b) || (b == c && b != a))
            printf("TRIANGULO ISOSCELES\n");
    return 0;
}