The tns file allows students to change the size of a circle and "capture" the length of its radius, diameter, circumference and area.
These data are stored automatically in a spreadsheet (page 1.4) and graphs can be drawn and analysed using pages 1.5 to 1.7. The dimensions of the circle are therefore represented in three ways: using geometry, as data in a spreadsheet, and in graphical format.
A lesson using this activity is described by Allan Duncan in a booklet entitled Inspired Connections in Maths Lessons. This description makes clear the power of the dynamically linked multiple representations to enhance student understanding.For a pdf version of the entire booklet please click here.
a) On page 1.4, to clear the data collected, use
b) To redraw the graphs with axes appropriate for the data use the Zoom - Data command: