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Classification Charts: 2D Shapes Go to Articles

 

Classification charts show hierarchical relationships between categories of items, such as objects or concepts. As you move from the top of the chart to the bottom, the categories become more specific. What is true for an item at the top of the chart is also true for all connected objects or concepts below it. However, what is true for an item at the bottom of the chart may be, but is not necessarily, true for the higher concept.

For an example, look at the classification chart for two-dimensional shapes below. Following the connections towards the top of the chart, you can see that a rhombus is also a kite, a convex quadrilateral, a polygon, and ultimately a simple, closed two-dimensional shape. Each of these categories of shapes can also be thought of as a family. 

From The ORIGO Handbook of Mathematics Education, 2007, ORIGO Education

Bibliography

The ORIGO handbook of mathematics education. (2007). Brisbane, Australia: ORIGO Education.

Usiskin, Z., Hirschhorn, D., Coxford, A., Highstone, V., Lewellen, H., Oppong, N., et al. (2002). Geometry (2nd ed.). Upper Saddle River, NJ: Prentice-Hall.

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