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Line 352:
Line 352: − + − + − + Line 366:
Line 366: − Chapatis, scissors and scale.+ − + − + − Instruct them to mark the center of circle by folding it twice over.<br>+ − Roll chapatis and cut using circular lids to get exact circle shape.+ − + − + − Can you distinguish major and minor arcs when the two radii involved are at 180 degrees.<br>+
→Concept #7 ARC
'''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
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>
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>
What are the arcs called when both major and minor arcs are of same size?<br>
===Activity No # ===
===Activity No # ===
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