This online course presents a conceptually-based approach to teaching mathematics and uses the straight-line coordinate geometry unit in which to do this. The course utilises GeoGebra, however, other dynamic geometry software, or indeed no dynamic geometry software, may be used. The success of this engaging, conceptual, inquiry-based approach lies in the fact that students, during the first few lessons, learn to perform the following skills without utilising formulae: read gradients from straight lines, sketch straight lines directly from equations (without using tables of values), ‘read’ an equation directly from its graph and find the midpoints and distance between pairs of points. Students who typically struggle with coordinate geometry tend to achieve far greater success and confidence with this approach. Towards the end of the unit traditional formulas are derived and then employed. Accredited PD Hours = 7

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