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=== Concept Map ===
=== Concept Map ===
[[File:Quadrilaterals.mm|flash]]
[[File:Quadrilaterals.mm|flash]]
+=Textbook=
+To add textbook links, please follow these instructions to: ([{{fullurl:{{FULLPAGENAME}}/textbook|action=edit}} Click to create the subpage])
+=Additional Information=
+This videos is related to classification and properties of quadrilaterals.
+{{#widget:YouTube|id=0OW2bU0So-4}} {{#widget:YouTube|id=udS3nkj2cfg}}
+==Useful websites==
+#[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here] : For effective introduction to quadrilaterals.
+#[http://www.mathopenref.com/quadrilateral.html click here] : Simple explanation about quadrilaterals.
+#[http://www.slideshare.net/muzzu1999/types-of-quadrilaterals-and-its-properties-group-4 click here] : This website has a very good activity on properties of quadrilaterals.
+#[http://www.cimt.plymouth.ac.uk/projects/mepres/book8/bk8i1/bk8_1i3.htm click here] This is a very good website for students to understand classification of quadrilaterals as per their properties.
+==Reference Books==
+*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]
=== Additional Resources ===
=== Additional Resources ===