Sir, try your construction in auotocad and then actually measure all the three angles that you feel are one third the original one. I have tried as per the steps you mentioned but it isn't trisecting at all. It in fact dividing the original angle in the ratio x:y:x . But a good try indeed.

Sir, try your construction in auotocad and then actually measure all the three angles that you feel are one third the original one. I have tried as per the steps you mentioned but it isn't trisecting at all. It in fact dividing the original angle in the ratio x:y:x . But a good try indeed.