Children’s hypotheses about properties of sides and internal and external angles can be verified by measurement. Children’s understanding of the angular properties of polygons can be developed. The ITP can be used to explore the properties of regular and irregular polygons. You can use the ruler or protractor to measure dragging it and using the circular button to rotate it to the required position. Double clicking on a vertex allows you to add remove the vertex or to add an extra vertex at the mid point of an adjacent side. A vertex on the polygon can be dragged to another position to change its shape and properties. The polygon can be translated and rotated. A background grid can be revealed and hidden and the displayed polygon can be enlarged using the pointers on the polygon button. This ITP displays regular polygons with 3 to 10 sides. They will remain freely available to all without the need for a subscription. I am remaking the ITPs so that they will work on all modern browsers and tablets.
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