Texas Instruments TINSPIRECX manual Dynamic Changes, Tidying Up and Using Attributes

First Steps with TI-Nspire™

Tutorial 5: Geometry

Now move to the top of the screen and enter some text, perhaps giving the user some explanation or instructions. You will need to press:

•b16 to select the Text option,

•Then click to start a box where text can be entered.

•Note you cannot do carriage returns in text boxes so do put in two lines you must use two text boxes!

Dynamic Changes
If you haven’t yet done so, try grabbing point A and sliding it
along its line. Make quite certain that you grab the point––
you must see its label. You may need to press e until the
point itself, rather than the triangle or label is selected. If you
do select the wrong item it is well worth remembering that
/d will undo any action if something happens that you
didn’t intend!
Notice that as you move the point, two sides of the triangle
and the label A all move too. What does not change however,
is the area.
	Ready to grab A and slide it
Now try grabbing and dragging point B or C, and then the
line segment BC and the line parallel to it. In each case notice
which other items on the screen move, and which do not.
Thinking about how each item was originally defined should
explain whether it moves in relation to other items.
Tidying Up and Using Attributes
Finally it’s well worth seeing how to improve the appearance
of the screen and preventing items from being grabbed
unintentionally.
For this activity the scale in the top right corner may not be
needed. You can hide it with option 8 in the View menu.
The point that defines the parallel line may be rather
distracting, so you could hide it using option 3 in the
Actions menu.
Now from the Actions menu choose option 4: Attributes.
	Changing the attributes of the triangle
Move the cursor to one of the sides of the triangle and
click (x) to select it.
This allows you to change the thickness and style of the line.
Press · to confirm your choices.
To change the shading of the shape, you need to ‘right-click’
on the triangle by placing the cursor over one of the edges
and pressing /b.

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