− | |[http://ncert.nic.in/NCERTS/textbook/textbook.htm?jemh1=13-14 NCERT Textbook Class - IX - Mathematics - Chapter - 7 - Surface Areas and Volumes] | + | |[http://ncert.nic.in/NCERTS/textbook/textbook.htm?jemh1=13-14 NCERT Textbook Class - IX - Mathematics - Chapter - 13 - Surface Areas and Volumes] |