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+Sum of the interior angles of a quadrilateral
−Sum of angles at point of intersection of diagonals in a quadrilateral
−Quadrilaterals are of different types. Grouping is made based on the four angle measures and/or sides. Each type is recognised with its characteristic properties. The types include regular, non-regular; convex, concave; parallelogram (square, rectangle, rhombus,) and non-parallelograms (trapezium and kite).
−====== [[Venn diagrams of quadrilaterals]] ======
+
=== Teaching Outlines ===
=== Teaching Outlines ===
−====Concept # 1. Introduction to Quadrilaterals====
+====Concept 1: Introduction to Quadrilaterals====
The word quadrilateral comes from two latin words "quadri" which means a "variant of 4" and 'latera' which means 'side'. A quadrilateral is a 4 sided figure with 4 sides, 4 angles and 4 vertices.
The word quadrilateral comes from two latin words "quadri" which means a "variant of 4" and 'latera' which means 'side'. A quadrilateral is a 4 sided figure with 4 sides, 4 angles and 4 vertices.
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====== [[Introduction to quadrilaterals]] ======
====== [[Introduction to quadrilaterals]] ======
−====Concept # 2.Properties of quadrilaterals====
+====Concept 3: Types of quadrilaterals====
+Quadrilaterals are of different types. Grouping is made based on the four angle measures and/or sides. Each type is recognised with its characteristic properties. The types include regular, non-regular; convex, concave; parallelogram (square, rectangle, rhombus,) and non-parallelograms (trapezium and kite).
+===== Activities # =====
+====== [[Quadrilaterals "I have - Who has?"|"I have - Who has ?"]]======
+====== [[Venn diagrams of quadrilaterals]] ======
+==== Concept 2: Properties of quadrilaterals ====
There are certain characteristic properties by which a quadrilateral is identified. A quadrilateral is a plane closed figure having 4 sides and 4 angles. The sum of all 4 interior angles of any quadrilateral always equals to 360 degrees.This is called interior angle sum property of a quadrilateral. The sum of all 4 exterior angles of any quadrilateral equals 360 degrees. This is called exterior angle sum property of the quadrilteral. The opposite angles of any quadrilateral are supplementary. If any 3 angles of a quadrilateral are known the fourth angle can be found using angle sum property.
There are certain characteristic properties by which a quadrilateral is identified. A quadrilateral is a plane closed figure having 4 sides and 4 angles. The sum of all 4 interior angles of any quadrilateral always equals to 360 degrees.This is called interior angle sum property of a quadrilateral. The sum of all 4 exterior angles of any quadrilateral equals 360 degrees. This is called exterior angle sum property of the quadrilteral. The opposite angles of any quadrilateral are supplementary. If any 3 angles of a quadrilateral are known the fourth angle can be found using angle sum property.
+
+===== Activities # =====
====== [[Angle sum property of a quadrilateral]]======
====== [[Angle sum property of a quadrilateral]]======
−====Concept #3. Types of quadrilaterals====
+====== Sum of the interior angles of a quadrilateral ======
−====== [[Quadrilaterals "I have - Who has?"|"I have - Who has ?"]]======
+====== Sum of angles at point of intersection of diagonals in a quadrilateral ======
−====== Area of a quadrilateral ======
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