Perimeter And Area Of A Circle- A Review
Chapter Name : Areas Related To Circles |
Sub Topic Code : 104_10_12_02_01 |
Topic Name : Perimeter And Area Of A Circle- A Review |
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Sub Topic Name : Perimeter And Area Of A Circle- A Review |
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Introduction
Area of a circle can be found by TT x radius x radius. Perimeter is found using 2 x TT x radius.
Pre-Requisites:
Meaning of area, perimeter, circle
Activity:
When fastened the watch is in form of a circle and encloses and area within it. Opening the strap shows its perimeter.
Real Life Question:
Will it cost the same to fence a circle and a rectangle shape with the same length of perimeter?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Circumference | The length of the outline of a circle (perimeter). |
| Radius | A line that joins the center of the circle with a point on its circumference. |
| (pi) TT | It is the constant ratio in circles of their circumference to the diameter. The value is 22/7 or 3.14. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Watch | Both area and perimeter can be observed. |
Real life uses :
Calculating costs of fencing land.
Practical examples around us
| Examples | Explainations |
|---|---|
| Pizza | Different sizes of pizza branded large, medium or small differ in area. |
What you learn in Theory:
Concepts about a circle’s area and its perimeter.
What you learn in Practice:
How perimeter and areas of circles are used in real life.