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* Digital : Computer, geogebra application, projector.
 
* Digital : Computer, geogebra application, projector.
 
* Non digital : Worksheet and pencil, compass, strings
 
* Non digital : Worksheet and pencil, compass, strings
* Geogebra files :  Introduction to chords.ggb
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* Geogebra files :  [https://ggbm.at/hkqkamre Introduction to chords.ggb]
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{{Geogebra|hkqkamre}}
    
===Process (How to do the activity)===
 
===Process (How to do the activity)===
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* Mark any two points on the circumference of a circle, join the two points. What is this line?
 
* Mark any two points on the circumference of a circle, join the two points. What is this line?
 
* Establish chord.
 
* Establish chord.
* Move the points to show how the chord length varies. Ask students to observe the changing chord lengths and when the chord length is maximum. Compare chord length with diameter.
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* Move the slider to show how the chord length varies. Ask students to observe the changing chord lengths and when the chord length is maximum. Compare chord length with diameter.
    
* How many parts is the circle divided into by the chord? What do you notice about these two parts?
 
* How many parts is the circle divided into by the chord? What do you notice about these two parts?

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