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Geometry 135
8
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 five app views:
• Plot view: provides drawing tools for you to construct
geometric objects
• Symbolic view: provides editable definitions 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
I 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 first change the number format to fixed at
3 decimal places. This will also help keep our geometry
workspace uncluttered.