#include <stdio.h>#include <math.h>#define EPS 1e-2double PI = acos(-1.0);double distance(double a,double b,double c,double d){double s;s = (a - c) * (a - c) + (b - d) * (b - d);s = sqrt(s);return s;}double ACOS(double x,double y,double z){double s;s = (y * y + z * z - x * x) / (2 * y * z);s = acos(s);return s;}int main(){double x1,x2,x3,y1,y2,y3,d1,d2,d3,A,B,C;int total;while(scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3)==6){ d1 = distance(x1,y1,x2,y2); d2 = distance(x2,y2,x3,y3); d3 = distance(x1,y1,x3,y3); if(d1 - d2 - d3 >= 0||d2 - d3 - d1 >= 0||d3 - d1 - d2 >= 0) { printf("Not a Trianglen"); continue; } total = 0; if(d1 - d2 < EPS && d2 - d1 < EPS) total ++; if(d1 - d3 < EPS && d3 - d1 < EPS) total ++; if(d2 - d3 < EPS && d3 - d2 < EPS) total ++; if(total == 0) printf("Scalene "); else if(total == 1) printf("Isosceles "); else printf("Equilateral "); A = ACOS(d1,d2,d3) * 180 / PI; B = ACOS(d2,d1,d3) * 180 / PI; C = ACOS(d3,d1,d2) * 180 / PI; if(A >= 92||B >= 92||C >= 92) printf("Obtusen"); else if(A < 88 &&B < 88 && C < 88) printf("Acuten"); else printf("Rightn");} printf("End of Outputn");return 0;}
