Changes

'''DEFINITION:''' part of a circumference of a circle

'''DEFINITION:''' part of a circumference of a circle

===Learning objectives===

===Learning objectives===

*The students should understand that an arc is a slice of a circle included between two radii of the circle.<br>

*The students should understand that an arc is a part of a circle included between two distinct  points of the circle.<br>

*The students should understand the two types of arcs -minor arc and major arc. The larger arc is called a major arc and the smaller one is called minor arc.

*The students should understand the two types of arcs -minor arc and major arc. The larger arc is called a major arc and the smaller one is called minor arc.

===Notes for teachers===

===Notes for teachers===

Explain the concept of arc by drawing a circle and two radii within it. The part of the circle enclosed within and outside the two radii are called its arcs.

Explain the concept of arc by drawing a circle and two points on its circumference. The part of the circumference within the two points in either directions are called its arcs. Show the labelling of arcs.

===Activity No # 1===

===Activity No # 1===

Get a circular chapati. Cut out a slice by marking its radii and depict major and minor arcs.<br>

Get a circular onion ring. Cut out a piece by marking two points on it and depict major and minor arcs.<br>

This is a classroom individual activity.<br>

This is a classroom individual activity.<br>

*'''Estimated Time''' : 10 minutes

*'''Estimated Time''' : 10 minutes

*Materials/ Resources needed

*Materials/ Resources needed

Chapatis, scissors and scale.

suitable onion rings, scissors.

*'''Prerequisites/Instructions, if any'''

*'''Prerequisites/Instructions, if any'''

The students should have prior knowledge of circle, circumference, radius and line segment.<br>

The students should have prior knowledge of circle and circumference.<br>

'''Instructions to the teacher:'''<br>

'''Instructions to the teacher:'''<br>

Instruct the children previous day to get circular chapatis.<br>

Instruct the children previous day to get circular onion rings.<br>

 

'''Instructions to the students:'''<br>

'''Instructions to the students:'''<br>

Roll chapatis and cut using circular lids to get exact circle shape.

Mark any two points on the circumference of onion ring and cut to get two arcs.

*Multimedia resources  

*Multimedia resources  

*Website interactives/ links/ / Geogebra Applets

*Website interactives/ links/ / Geogebra Applets

*'''Process/ Developmental Questions'''

*'''Process/ Developmental Questions'''

*'''Evaluation'''

*'''Evaluation'''

Were the chapatis exact in circle shape.<br>

Were the rings exact in circle shape.<br>

Could the students mark its centre, radii and identify the major and minor arcs.

Could the students identify the major and minor arcs.

*'''Question Corner'''

*'''Question Corner'''

What is the longest arc of a circle which forms the circle called?<br>

What is the longest arc of a circle which forms the circle called?<br>

Can you distinguish major and minor arcs when the two radii involved are at 180 degrees.<br>

What are the arcs called when both major and minor arcs are of same size?<br>

===Activity No # ===

===Activity No # ===

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