I have to appreciate you first esbauce your entrance in this blog is through my post. It is the first correct solution.I expect your valuable comments and contributions in future also.Before observing your profile I told Hari sir,one of the blog developers that desertfox is a professional engineer.We,the teachers can feel it from your sudden answer.Thank you very much @Bhama teacher and Vijayan sir are our team members.Their comments always enrich the blog . Without them no post goes to backpages.I also make comments on their posts .Thakyou verymuch. @ The most important person on the post is Thomas sir.Many times I feel his extraordinary vision on Geometrical problems.I feel a real ,talented mind on him.If the problem is on geometry,Thomas sir will have his own way.Thankyou thomas sir @ Shal I ask a question? Name a talented,hardworking ,intellgent, non mathematics teacher ,SITC who has a strong determination to open the mathsblog post first in the morning.Thanks for that person in the name of mathemtics teachers Thank you Geetha teacher.@ thank you for all unknown readers who are decided to use the question in the class for the benift of children. Special thanks to Suboth sir. JOHN P A HIBHS VARAPUZHA