
9 Geometry
The Geometry app enables you to draw and explore geometric constructions. A geometric construction can be
composed of any number of geometric objects, such as points, lines, polygons, curves, tangents, and so on.
You can take measurements (such as areas and distances), manipulate objects, and note how measurements
change.
There are ve app views:
●
Plot view: provides drawing tools for you to construct geometric objects
●
Symbolic view: provides editable denitions of the objects in Plot view
●
Numeric view: for making calculations about the objects in Plot view
●
Plot Setup view: for customizing the appearance of Plot view
●
Symbolic Setup view: for overriding certain system-wide settings
There is no Numeric Setup view in this app.
To open the Geometry app, press and select Geometry. The app opens in Plot view.
Getting started with the Geometry app
The following example shows how you can graphically represent the derivative of a curve, and have the value
of the derivative automatically update as you move a point of tangency along the curve. The curve to be
explored is y = 3sin(x).
Since the accuracy of our calculation in this example is not too important, we will rst change the number
format to xed at 3 decimal places. This will also help keep our geometry workspace uncluttered.
Preparation
1.
Press .
2. On the rst CAS settings page, set the number format to Standard and the number of decimal places to
4.
Opening the app and plotting the graph
1.
Press and select Geometry.
If there are objects showing that you don’t need, press and conrm your intention by
tapping
.
The app opens in Plot view. This view displays a Cartesian plane with a menu bar at the bottom. Next to
the menu bar, this view displays the coordinates of the cursor. After you interact with the app, the
Getting started with the Geometry app 149
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