On analysing the properties of different quadrilaterals in Part 1 and Part 2, (https://connect2context.com/2025/03/20/investigating-quadrilaterals/ and https://connect2context.com/2025/03/26/investigating-quadrilaterals-part-2/) here is a ‘Quadrilateral Classification tree‘ which would be helpful in understanding their grouping, when used in conjunction with the ‘Quadrilateral Chart’ table in the Part 1.     The above chart is read as ‘Square is a rectangle’;

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