Changes

==Reference Books==

==Reference Books==

* Please download 9th standard mathematics textbook from the following link and refer the page 89 [http://www.textbooksonline.tn.nic.in/Std9.htm click here]

* Please download 9th standard mathematics textbook of Tamil Nadu state syllabus from the following link and refer the page 89 [http://www.textbooksonline.tn.nic.in/Std9.htm click here]

* Refer 9th standard mathematics ncert  textbook from the following link [http://www.ncert.nic.in/ncerts/textbook/textbook.htm?iemh1=8-15 click here]

* Refer 9th standard mathematics ncert  textbook from the following link [http://www.ncert.nic.in/ncerts/textbook/textbook.htm?iemh1=8-15 click here]