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[*]Brief: User draws the angle bisector of ∠ABC (∠CBA) through interacting with GeoGebra. Based on the user’s own experience constructed the angle bisector of ∠ABC (∠CBA) and using the fact of the drawn construction that the angle bisector divides the angle in half, the user can justify an angle bisector drawn by GeoGebra. To test the angle bisector drawn by GeoGebra, the user may or may not construct the angle bisector of ∠ABC (∠CBA). Then, the user finally proves the angle bisector of an arbitrary angle based on the user’s own construction experience and the knowledge of a triangle congruent property (Side Side Side).
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[*]Goal: Understanding angle bisector
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[*]Grade: 6-9 (especially 6th grade and 7th grade)
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[*]Strand: Measurement and Geometry, Geometry
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[*]Keywords: angle, angle bisector, triangle congruent property, construction, interactivity, geogebra
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[*]Comments: Suitable for 6th-grade on up
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[*]Cost: Activity and software is free to use
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[*]Download: Requires freeware GeoGebra (www.geogebra.org) for offline use.
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