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Line 132: − '''DEFINITION:''' − ''The bounding line of the circle is called circumference'' − + + − + Line 143:
Line 142: − + − + − − − + − + + − '''Instructions to the teachers'''<br>+ − + − '''Instructions for the students'''<br>+ − + − + − + − + − +
→Concept #3 CIRCUMFERENCE
[[File:circum.jpg|200px|right]]
[[File:circum.jpg|200px|right]]
===Learning objectives===
===Learning objectives===
The student needs to understand that the circumference is the outer boundary of a circle.
# The students should understand that the circumference is the outer boundary of a circle.
# It is equivalent to perimeter.
===Notes for teachers===
===Notes for teachers===
Explain that every point on the circumference is at equidistant from the centre.
# Explain that every point on the circumference is at equidistant from the centre.
===Activity No #1 ===
===Activity No #1 ===
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
|}
|}
*Estimated Time
*Estimated Time :10 minutes.
10 minutes.
*Materials/ Resources needed: white paper, compass and colour pencils.
*Materials/ Resources needed
white paper , compass and colour pencils.
*Prerequisites/Instructions, if any
*Prerequisites/Instructions, if any
The student should know to use the compass.<br>
# The student should know to use the compass.
The student should understand the circumference as outer boundary.
# The student should understand the circumference as outer boundary which is defined.
# A circle is drawn using radius as a measure.
*Multimedia resources
*Multimedia resources
Geogebra
Geogebra
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
*Process/ Developmental Questions
*Process/ Developmental Questions
Instructions to the teachers
Ask the children to draw circles.<br>
# Ask the children to draw circles.<br>
Instructions for the students
Colour circumference by fitting small colour pencil in compass itself.
# Colour circumference by fitting small colour pencil in compass itself.
*'''Evaluation'''
*Evaluation
Observe for the skill in using compass and drawing the circle.
Observe for the skill in using compass and drawing the circle.
*'''Question Corner'''
*Question Corner
Is the distance between centre of the circle and its circumference constant ?<br>
# Is the distance between the centre of the circle and its circumference constant ?
What is the distance between the center of a circle and its circumference called?
# What is the distance between the center of a circle and its circumference called?
==Concept #4 SEMICIRCLE==
==Concept #4 SEMICIRCLE==