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From Karnataka Open Educational Resources
→Concept #4 SEMICIRCLE
==Concept #4 SEMICIRCLE==
==Concept #4 SEMICIRCLE==
[[File:semicircle.gif|200px|right]]
[[File:semicircle.gif|200px|right]]
===Learning objectives===
==='''Learning objectives'''===
# The students should be able to understand that a diameter divides the circle into two equal halves and each such half is a semicircle or hemicircle.
# The students learn how to form a semicircle by joining any two points on the circumference through its centre i.e. by drawing a diameter.
==='''Notes for teachers'''===
==='''Notes for teachers'''===
Show children the forming of semicircle by drawing diameter.
# Show children semicircle by drawing diameter.
==='''Activity No # 1'''===
===Activity No # Semicircle===
Bring cut circles of different sizes, fold them into exact halves and help them recognise semicircles. Let them colour each half with different colour.<br>
# Bring cut circles of different sizes.
# Fold them into exact halves.
# Recognise semicircles. Let them colour each half with different colour.
Materials: White paper circles, crayons.
White paper, crayons.
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
''[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
*Materials/ Resources needed
*'''Materials/ Resources needed'''
White paper, crayons.
White paper, crayons.
*'''Prerequisites/Instructions, if any'''
*Prerequisites/Instructions, if any
The students should have prior knowledge of circle and diameter.
# The students should have prior knowledge of circle and diameter.
*'''Multimedia resources'''
*Multimedia resources
Geogebra
Geogebra
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
*'''Process/ Developmental Questions'''
*Process/ Developmental Questions:
# Identify the centre, circumference, diameter and semicircle of the circle.
Ask children the previous day to cut circles of given radius and bring.
Instructions to the teacher:
# Ask children the previous day to cut circles of given radius and bring.
Instructions to the students:
Instruct them to fold circle into exact half. Draw diameter on folded line and colour each half with different colour.
# Instruct them to fold circle into exact half.
*'''Evaluation'''
# Draw diameter on folded line and colour each half with different colour.
Were the students able to draw and cut perfect circles?<br>
*Evaluation
Was the folded line (diameter) passing through the center of circle?<br>
# Were the students able to draw and cut perfect circles?
*'''Question Corner'''
# Was the folded line (diameter) passing through the center of circle?
In how many different ways can you draw semicircles for a given circle?
*Question Corner
# In how many different ways can you draw semicircles for a given circle?
===Activity No # ===
===Activity No # ===
