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→Process (How to do the activity)
* 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
* Geogebra files : [https://ggbm.at/hkqkamre Introduction to chords.ggb]
{{Geogebra|hkqkamre}}
===Process (How to do the activity)===
===Process (How to do the activity)===
* 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.
* 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?