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Page 36 © 2012 Texas Instruments Educaon Technology
The next step is to draw a line parallel to BC. This is a
construcon so you need to press bA.
Choose opon
You must specify two things: the line to which it is to be
parallel, and a point the line must pass though (although
these can be chosen in either order). So move the cursor
to the segment BC––you will see its label when you are in
the right posion. Click (x) to select the segment, move
away, dragging a doed parallel line and when happy with
its posion click again. Once again, don’t forget to press d,
if you do not want to add another parallel line.
At this point it is worth moving the cursor around the
screen to see which objects can be grabbed and dragged.
You should see the open hand cursor (÷) appear for point B,
for point C, for the segment BC, and for the point xing the
parallel line. All of these are grabbable.
However, the parallel line itself cannot be grabbed and
dragged. It can however be selected for various purposes.
For example, you could delete it by clicking (x) to select it
and then pressing . to remove it.
First, a point A is needed on the parallel line. Later you will be
sliding this point along the line without moving the line itself,
so the point that you have already which denes the line is
not a good one to use. Therefore press b72 to select the
opon: . Move the cursor to a new posion on the
line and then click (x) then press: gAd. The triangle
itself can be constructed using the Shapes menu (b92).
Check that the correct icon is showing in the top le corner,
and then carefully select, in any order, each of the points
A, B and C.
Make certain you don’t click unl its label and the poinng-
nger icon appears as shown here.
Many opons in the Construcon menu
Selectable, but not grabbable!
Point A is ready to be selected