Shape Shape Shape Shape
Kinds Of Quadrilateral
Chapter Name : Understanding Quadrilateral
Sub Topic Code : 104_08_03_04_05
Topic Name : Kinds Of Quadrilateral
Sub Topic Name : Angles Of A Parallelogram
Introduction

The mounts are often in the shape of a quadrilateral whose opposite sides are parallel. Such a quadrilateral is known as a Parallelogram. This specific geometry gives the parallelogram specific characteristics. One of the property is that the opposite angles of a parallelogram are equal.

Pre-Requisites:

Basic knowledge about Quadrilaterals

Activity:

The strings made of rubber will remain parallel and equal in length when one stick is moved either vertically or horizontally. Mark all the adjacent sides and angles. Measure the angles to verify the property.

Real Life Question:

What is the shape of mount that are used to mount telescopes in observatories for general public??

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Parallelogram A quadrilateral whose opposite sides are parallel
Quadrilateral A simple closed curve with four vertices and four sides
Learning aids / Gadgets
Gadgets How it can be used
Sticks, rubber bands, protractor Take two sticks of equal length and place them parallel on a surface. Make two long rubber band strings of same length. Join the starting ends of both sticks with one rubber string and the other ends of both the sticks with other string. Keep a stick stationary while moving the other stick horizontally or vertically. Measure the angles.
Real life uses :

Astronomy, tall building structures, bridges, towers, books, wallets, railway tracks

Practical examples around us
Examples Explainations
Eraser The erasers are also parallelograms. The opposite sides are parallel to each other.
Book A book is a parallelogram. The opposite sides in a book are parallel.
What you learn in Theory:

An Intro into angles of parallelograms

What you learn in Practice:

Many design applications in the field of engineering heavily depend upon the properties of parallelogram. It is also an important component in vector studies which is an important part of applied and theoretical physics and advanced mathematics.

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