triangle inequality

Counting and the study of mathematics go a long way back. In this article, geometry and counting come together to provide an interesting window to mathematical thinking and reasoning. Geometrical constructions provide a hands-on aspect and teachers of classes 6-10 can use this article to design GeoGebra investigations, mathematical discussions with trigger questions or even an unusual revision worksheet.

A nice investigation with dynamic geometry for students at high school is the so-called Midpoint Trapezium theorem...
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