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142 Geometry
Creating or selecting an object always involves at least two
steps: tap and press
E. Only by pressing E do
you confirm your intention to create the point or select an
object. When creating a point, you can tap on the screen and
then use the cursor keys to accurately position the point before
pressing
E.
Note that there are on-screen instructions to help you. For
example, Hit Center means tap where you want the center
of your object to be, and Hit Point 1 means tap at the
location of the first point you want to add.
You can draw any number of geometric objects in Plot view.
See “Geometric objects” on page 153 for a list of the objects
you can draw. The drawing tool you choose—line, circle,
hexagon, etc.—remains selected until you deselect it. This
enables you to quickly draw a number of objects of the same
type (such as a number of hexagons). Once you have finished
drawing objects of a particular type, deselect the drawing tool
by press
J. (You can tell if a drawing tool is still active by
the presence of on-screen help at the top left-side corner of the
screen, help such as Hit Point 1.)
An object in Plot view can be manipulated in numerous ways,
and its mathematical properties can be easily determined
(see page 150).
Object naming Each geometric object you create is given a name. In the
example shown on page 141, note that the circle has been
named C. Each defining point is also been named: the center
point has been named A, and the point tapped to set the
radius of the circle has been named B.
It is not only the points that
define a geometric object
that are given a name. Every
component of the object that
has any geometric
significance is also named.
If, for example, you create a
hexagon, the hexagon is
given a name as is each point at each vertex. In the example
at the right, the pentagon is named C, the points used to
define the hexagon are named A and B, and the remaining