Introduction
Chapter Name : Circles |
Sub Topic Code : 104_10_10_01_01 |
Topic Name : Introduction |
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Sub Topic Name : Introduction |
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Introduction
A circle is a collection of all points in a plane which are at a constant distance (radius) from a fixed point (centre). A line that intersects the circle at one point is called a tangent and intersection of a circle at two points by a line is a secant.
Pre-Requisites:
Basic concept of shapes and angles
Activity:
A wheel has a circular outline. The inner spokes are secants and the surface is tangent to the wheel.
Real Life Question:
What are the common circular objects that we come across in our day to day life?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Circle | A collection of points in a plane from a common center and distance. |
| Secant | A line intersecting a circle at 2 points. |
| Tangent | A line that intersects the circle at one point. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Wheel | Concepts of circle, secant and tangent can be observed. |
Real life uses :
In geometrical applications and in objects like wheels and balls.
Practical examples around us
| Examples | Explainations |
|---|---|
| Wheels and watch dials | They are objects of circular shape and lines that run across in them are secants. |
What you learn in Theory:
Basic concepts of circles.
What you learn in Practice:
The existence of circular objects in everyday life.