|[http://www.ncert.nic.in/ncerts/textbook/textbook.htm?jemh1=6-14 NCERT Textbook Class - X - Mathematics - Chapter - 6 - Triangles] | |[http://www.ncert.nic.in/ncerts/textbook/textbook.htm?jemh1=6-14 NCERT Textbook Class - X - Mathematics - Chapter - 6 - Triangles] |