Polygons
Chapter Name : Understanding Quadrilateral |
Sub Topic Code : 104_08_03_02_01 |
Topic Name : Polygons |
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Sub Topic Name : Classification Of Polygons |
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Introduction
Kite, pizza slice etc have shapes which seem to be formed out of closed curved consisting of lines joined at the ends. Such closed curves formed out of 3 or more lines are called polygons
Pre-Requisites:
Basic knowledge about polygons
Activity:
Draw polygons with different number of sides and observe how the angle included between 2 sides varies the shape. Cut outs can be made on card board sheets.
Real Life Question:
What is the shape of a pizza slice, kite, coke bottle cap?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Polygon | A simple closed curve classified according to number of sides and vertices |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Scissors, paper, sketches | Polygons are drawn on the paper as plane surfaces increasing one vertex and a side at a time. |
Real life uses :
Books, Blankets, TV’s, Pizza cases, Tray’s, blocks, bricks, photographs, frames etc have polygons as perimeters or surfaces
Practical examples around us
| Examples | Explainations |
|---|---|
| Floor tiles | The floor tiles have also plane surfaces with four sides and four vertices. |
| Computer monitors | The monitors form the shape of a rectangle or a square. Their faces are plane surfaces with four sides and four vertices |
What you learn in Theory:
An Intro into polygons and their classification.
What you learn in Practice:
A polygon is defined by the number of its sides and vertices it has. Depending on their number, a polygon changes shape and is called by other names. Many complex structures like air-plane surfaces etc. use these basic polygons for design.