3

#include <stdio.h>
int main()
{
    double x,y,z;
    printf("Enter Three Angales:");
    scanf("%lf %lf %lf",&x,&y,&z);
    if((x+y+z)==180){
        printf("Triangle is Valid\n");
    }
    else
        printf("Triangle is not Valid!!!");


    return 0;

}