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© 2012 Texas Instruments Educaon Technology Page 53
The previous seven tutorials have introduced many of the key features of TI-Nspire learning technology, with
each of the applicaons being discussed separately. However, one of the great strengths of TI-Nspire is that
it allows the applicaons to be linked dynamically, encouraging dierent approaches to problem solving.
This appendix oers an example of what is meant by “mulple representaons”, showing how several of the
applicaons can be used to invesgate a mathemacal concept, in this case the relaonship between a circle’s
diameter and circumference and between its radius and area.
By working through this appendix you will be able to revise many of the skills and techniques you met in the
tutorials. Here detailed instrucons and key presses have been omied though you will nd back references
if you need to remind yourself about parcular techniques. However, try to concentrate on the big picture
of what is going on, asking yourself how each of the mulple representaons contributes to a deeper
understanding of the mathemacs.
• Open a new document with a page.
• Construct a large circle on the screen.
• Construct a radius by drawing a from the
centre to the circumference.
• To construct a diameter rst construct a (not a
segment) from the centre to the circumference. Then
construct the of the line and the
circle: this generates the point on the opposite end
of the diameter.
• Now measure the lengths of the radius, the diameter
and the circumference. Also measure the area. In each
case change the number of decimal points displayed.
• Finally assign the measurements to variables. Click on
each measurement in turn. Press h. Type the leer
appropriate for each measurement (, , and ) and
press ·.
• Check that the measurements all change when you
grab the edge of the circle and change its size.
A measured circle