Some Special Parallelogram
Chapter Name : Understanding Quadrilateral |
Sub Topic Code : 104_08_03_05_02 |
Topic Name : Some Special Parallelogram |
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Sub Topic Name : A Rectangle |
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Introduction
Rectangle is a parallelogram in which all the interior angles are right angles.
Pre-Requisites:
Basic knowledge about Quadrilaterals
Activity:
The lengths of parallel sides are equal. The diagonals of rectangle are of equal length and bisect each other perpendicularly.
Real Life Question:
Is rectangle a parallelogram or can we say that all parallelograms are rectangles?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Rectangle | A quadrilateral with all the angles equal to 90 degrees |
| Quadrilateral | A simple closed curve with four vertices and four sides |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Drawing board, pins, scale, charts, pencil, ice cream sticks | Draw a rectangle and its diagonals on a chart placed on a drawing board. Mark all the vertices and the intersection point of the diagonals with pins. Join them with ice cream sticks. Count the number of sticks and indicate length. |
Real life uses :
Racks, doors, windows, walls, tiles, boards, table surfaces, pads, wallet
Practical examples around us
| Examples | Explainations |
|---|---|
| Match box | A match box has parallel opposite sides that are equal. It is equiangular and equal to 90 degrees |
| Book | A book also has parallel opposite sides that are equal. It is also equiangular and 90 degrees |
What you learn in Theory:
An Intro into rectangles
What you learn in Practice:
Many design applications in the field of engineering heavily depend upon the properties of parallelogram, especially rectangles. Even in simple goods which we use everyday have rectangular shape. It is also an important component in vector studies which is an important part of applied and theoretical physics and advanced mathematics.