Sector of a circle

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Teaching Outlines

Concept #1 CIRCLE CENTRE

Learning objectives

1. Define circle
2. give examples for circles
3. Locate centre for the given circle.

Notes for teachers

Define circle and centre with the help of a diagram

Activity No # 1 To locate centres for circles

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• Estimated Time

20 minutes

• Materials/ Resources needed

For the teacher: chalk piece, geometry set.
for the student: paper

• Prerequisites/Instructions, if any

Instructions for the teacher: Draw few circles of different radii and name the centres
Instructions for the student : name the centres of different circles

• Multimedia resources
• Website interactives/ links/ / Geogebra Applets
• Process/ Developmental Questions

Identify the centre.

• Evaluation

1. How many centres does a circle has?
   
2. Where does the centre of the circle lie? (inside/outside)

• Question Corner

Is there a circle with 3/4/5 centres?

Activity No # 2

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• Estimated Time
• Materials/ Resources needed
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• Process/ Developmental Questions
• Evaluation
• Question Corner

Concept #2 diameter

Learning objectives

to draw circle
to draw a diamter use of geometrical instruments

Notes for teachers

explain the concepts using requisite diagrams. Conduct this activity.

Activity No #1

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• Estimated Time

20 minutes

• Materials/ Resources needed

different coloured circular cutouts

• Prerequisites/Instructions, if any
  

1. The student should have knowledge of circles.
2. The student should have skill of paper folding

• Multimedia resources
• Website interactives/ links/ / Geogebra Applets
• Process/ Developmental Questions

instructions to the teacher:
The teacher distributes the paper cut outs to all the students.
Ask every student to make 2 equal parts by folding.
What happens if it is folded again to get equal parts?
Ask the students to identify the folded lines/marks

instructions to the student:
fold the paper cut out as per instructions
observe and mark the folded line.
Identity the diameter and radius.

• Evaluation

1. Was the student successful in marking radius and diamter?
   
2. Was the student successful in folding and marking?
   
3. Was the student able to relate radius and diameter.
   

• Question Corner

how many such radii and diameters can be drawn to a given circle?

Activity No #

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• Estimated Time
• Materials/ Resources needed
• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ / Geogebra Applets
• Process/ Developmental Questions
• Evaluation
• Question Corner

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