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'''DEFINITION:'''
−''The fixed point in the circle is called centre.''
'''DEFINITION:'''<br>
use of geometrical instruments+explain the concepts using requisite diagrams. Conduct this activity.+different coloured circular cutouts
+observe and mark the folded line.<br>+ Identity the diameter and radius.<br>+
==Concept #1 CIRCLE CENTRE==
==Concept #1 CIRCLE CENTRE==
[[File:radius.jpg|200px|right]]
[[File:radius.jpg|200px|right]]
−===Learning objectives===
===Learning objectives===
# The students should understand that centre is that fixed point in the circle from which all points are at equal distance.
# The students should understand that centre is that fixed point in the circle from which all points are at equal distance.
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*Prerequisites/Instructions, if any
*Prerequisites/Instructions, if any
''Instructions for the teacher:'' Draw few circles of different radii and name the centres <br>
''Instructions for the teacher:'' Draw few circles of different radii and name the centres <br>
−''Instructions for the student'' : name the centres of different circles
+''Instructions for the student'' : Name the centres of different circles
*Multimedia resources
*Multimedia resources
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
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==Concept #2 Radius and Diameter==
==Concept #2 Radius and Diameter==
[[File:rad_dia.jpg|200px|right]]
[[File:rad_dia.jpg|200px|right]]
−''RADIUS:A straight line drawn from centre to the circumference''<br>
''RADIUS:A straight line drawn from centre to the circumference''<br>
''DIAMETER:A straight line drawn through the centre and terminated both ways by the circumference.''
''DIAMETER:A straight line drawn through the centre and terminated both ways by the circumference.''
===Learning objectives===
===Learning objectives===
−to draw circle<br>
+# The students should understand that radius is a straight line joining centre of a circle to any point on the circumference.
−to draw a diamter
+# They need to learn the use of compass.
−# Skill of drawing the circle accurately.
===Notes for teachers===
===Notes for teachers===
−Explain the concepts using requisite diagrams.
===Activity No #1 ===
===Activity No #1 ===
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
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''[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 : 20 minutes
−20 minutes
+*Materials/ Resources needed: Different coloured papers.
−*Materials/ Resources needed
−*Prerequisites/Instructions, if any <br>
*Prerequisites/Instructions, if any <br>
−#The student should have knowledge of circles.
+#The student should have knowledge of circle and radius.
−#The student should have skill of paper folding
+#The student should have skill of paper folding.
*Multimedia resources
*Multimedia resources
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
*Process/ Developmental Questions
*Process/ Developmental Questions
''instructions to the teacher:''<br>
''instructions to the teacher:''<br>
−The teacher distributes the paper to the students. <br>
+# The teacher distributes the paper to the students.
−Ask every student to make 2 equal parts by folding.<br>
+# Shows them how to use compass and draw a circle.
−What happens if it is folded again to get equal parts?<br>
+# Ask every student to make 2 equal parts by folding.
−Ask the students to identify the folded lines/marks<br>
+# What happens if it is folded again to get equal parts?
−# Ask the students to identify the folded lines/marks
−''instructions to the student:''<br>
+''instructions to the student:''
−fold the paper cut out as per instructions<br>
+# Draw a circle of given radius.
−# Cut out the circle.
−# Fold the circle into two equal halves.
+# Again fold into further equal halves.
+# Oserve and mark the folded line.
+# Identity the diameter and radius.
*Evaluation
*Evaluation
−#Was the student successful in marking radius and diamter?<br>
+# Was the student successful in marking radius and diameter?
−#Was the student successful in folding and marking?<br>
+# Was the student successful in folding and marking?
−#Was the student able to relate radius and diameter.<br>
+# Was the student able to relate radius and diameter.
*Question Corner
*Question Corner
−How many such radii and diameters can be drawn to a given circle?
+# How many such radii and diameters can be drawn to a given circle?
===Activity No # ===
===Activity No # ===
