883
edits
Changes
From Karnataka Open Educational Resources
no edit summary
=== 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.
====== [[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 ======
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
