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| ==Concept #4 SEMICIRCLE== | | ==Concept #4 SEMICIRCLE== |
| [[File:semicircle.gif|200px|right]] | | [[File:semicircle.gif|200px|right]] |
− | '''DEFINITION:''' PART OF A CIRCLE BOUNDED BY DIAMETER AND THE PART OF A CIRCUMFERENCE CUT OFF BY THE DIAMETER
| + | ===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 student should be able to understand that a diameter divides the circle into two equal halves and each such half is a semicircle or hemicircle.<br>
| + | # 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. |
− | * The student learns how to form a semicircle by joining any two points on the circumference through its centre .
| |
| ==='''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. |
− | '''Sub units of activities:'''<br>
| + | # Recognise semicircles. Let them colour each half with different colour. |
− | This is a classroom individual activity.<br>
| + | Materials: White paper circles, crayons. |
− | '''Materials:'''
| |
− | 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 |
− | 15 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: |
− | '''Instructions to the teacher:'''
| + | # 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:'''
| + | 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 # === |