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• : for adding various polygons, such as a triangle, quadrilateral, square, parallelogram, etc.
• : for adding various curves (such as a circle, ellipse, or hyperbola) and defining various plots you want to add to Plot
view (such as a function, parametric, or polar plot). For example, to draw y = 1/x, tap , select Plot and Function.
If there are function plots defined in the app, a menu appears for you to select one if you wish; otherwise select New.
plotfunc( appears on the entry line. Enter 1
nASsE. The equation is plotted. (Note that in the
Geometry app, built-in variables in expressions must be in lowercase. User-defined variables can be in any case.)
• : for transforming an object. The options available are translation, reflection, dilation,
projection, inversion, and reciprocation. For example, to reflect an object, tap and
select Reflection. Tap the object (point or straight object) that is to be the center and
press
E. Now tap on the object that is to be reflected and press E. The selected
object is reflected over the center. (Notice, in the illustration at the right, how circle G is a
reflection over point E of circle C.)
Symbolic view Every object—whether a point, segment, line, polygon, or curve—is given a
name, and its definition is displayed in Symbolic view (
Y). The name is the name for it you see
in Plot view prefixed by “G”. Thus a point labeled B in Plot view is given the name GB in Symbolic view.
The G-prefixed name is a variable that can be referenced in Numeric view (see below) and in CAS
calculations. Note from the illustration at the right that GG is the name of the variable that
represents the circle just reflected. If you are working in the CAS and want to know what the area
of that circle is, you could enter area(GG) and get the result.
You can change the definition of an object by selecting it and tapping . The object is
modified accordingly in Plot view. For example, if you wanted to change the point of reflection in
the circle example above, just select point GE and change its arguments. (The arguments are the
coordinates of the point.)
You can also create an object in Symbolic view. Tap , define the object—for example, point(4,6)—and press E.
The object is created and can be seen in Plot view. (Various commands are available from the menu that appears when
you are adding or editing a definition.) You can also rename and delete objects in Symbolic view, and also deselect them. By
deselecting an object you hide it in Plot view.