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© 2012 Texas Instruments Educaon Technology Page 35
Drawing the base of the triangle
Noce that as usual the relevant icon
appears in the top le corner of the screen.
This tutorial introduces interacve geometry in TI-Nspire and builds upon the methods and features of
the Graphs and Geometry applicaons that were covered in Tutorial 4. You are led step by step through a
geometrical construcon which illustrates the simple concept that the areas of triangles with a xed base and
constant height are equal. As you work through the construcon you will meet many of the features that make
this one of the most powerful and aracve components of TI-Nspire.
If necessary open your FirstSteps5 document and use the
c key then select to create a new Geometry page.
Much like with a Graphing page it is possible to convert the
Plane Geometry page in to a Graphing page by selecng
b21. However for now leave the page in
.
We will start by drawing a line segment to represent the
base of a triangle and labelling it BC: press b7 to see the
opons available for drawing Points & Lines. Segments have
two disnct end points, lines are (in theory) innite, while
rays have just one end. So choose opon .
Move the cursor to a suitable posion for point B. Then click
(x) to x the point and then gB to give it a label of .
Move the cursor to where you want the other end of the
segment to be. Mark the point and label it C in the same way.
The icon in the top le corner is sll showing you that you
could draw another segment if you wish. Press d to
remove the icon and leave that mode of operaon.