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Page 38 © 2012 Texas Instruments Educaon Technology
Ready to grab A and slide it
Changing the aributes of the triangle
Now move to the top of the screen and enter some text, perhaps giving the user some explanaon or
instrucons. You will need to press:
• b16 to select the Text opon,
• 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!
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 unl 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 acon if something happens that you
didn’t intend!
Noce 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.
Now try grabbing and dragging point B or C, and then the
line segment BC and the line parallel to it. In each case noce
which other items on the screen move, and which do not.
Thinking about how each item was originally dened should
explain whether it moves in relaon to other items.
Finally it’s well worth seeing how to improve the appearance
of the screen and prevenng items from being grabbed
unintenonally.
For this acvity the scale in the top right corner may not be
needed. You can hide it with opon 8 in the View menu.
The point that denes the parallel line may be rather
distracng, so you could hide it using opon 3 in the
Acons menu.
Now from the Acons menu choose opon .
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 conrm 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.