Texas Instruments -83 Plus Silver Edion User manual

7/31/01 ©2001 Texas Instruments
ËË
TI-83 Plus GeoMaster
Application
Getting Started
Start here
How To…
Draw Objects Transform Objects
Compare Objects Display Information
Store Data Move Objects
Examples
Performing Calculations
Displaying Equations and Coordinates
Comparing Objects
More Information
Quick Reference Guide
Customer Support
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Important Information
Texas Instruments makes no warranty, either expressed or
implied, including but not limited to any implied warranties of
merchantability and fitness for a particular purpose, regarding
any programs or book materials and makes such materials
available solely on an "as-is" basis.
In no event shall Texas Instruments be liable to anyone for
special, collateral, incidental, or consequential damages in
connection with or arising out of the purchase or use of these
materials, and the sole and exclusive liability of Texas
Instruments, regardless of the form of action, shall not exceed
any applicable purchase price of this item or material. Moreover,
Texas Instruments shall not be liable for any claim of any kind
whatsoever against the use of these materials by any other
party.
Graphing product applications (Apps) are licensed. See the
terms of the license agreement for this product.
GeoMaster, TI-GRAPH LINK, and TI-Cares are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.

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What is the GeoMaster Application?
The GeoMaster™ application is a Flash software application that
runs on the TI-83 Plus. Using this application, you can draw and
transform objects, working with them interactively. The
GeoMaster application also allows you to graph equations from
the Y= editor and stat plots on the same screen with objects you
draw using GeoMaster tools.
Following are some of the things you can do with the GeoMaster
application:
•Draw points, lines, segments, circles, and polygons.
•Translate, reflect, rotate, and dilate objects.
•Measure lengths, areas, perimeters, angles, and determine
slope.
•Display equations of circles and lines and coordinates of
points.
•Store measured values in TI-83 Plus lists for plotting and
analysis.

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What You Need
To install and run the GeoMaster™ application, you need:
•A TI-83 Plus calculator with version 1.13 or later of the
operating system software to optimize the performance of your
calculator and the application. You can download a free copy
of the latest operating system software from
education.ti.com/softwareupdates.
•TI-GRAPH LINK™ computer-to-calculator cable. If you do not
have this cable, call your distributor, or order the cable online
from TI's online store.
•9-pin to 25-pin cable adapter (required only if you are
connecting to a 25-pin serial port on the computer).
•TI-GRAPH LINK software that is compatible with the
TI-83 Plus. You can download a free copy of this software
from education.ti.com/softwareupdates.
Where to Find Installation Instructions
Detailed instructions on installing this and other applications are
available at education.ti.com/guides. Follow the link to Flash
installation instructions.

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Getting Started
Work through this exercise to become familiar with the basic
features of the GeoMaster™ application. In this exercise, you
draw a triangle that is circumscribed by a circle, and then move
the triangle to see what happens to the circle and the
perpendicular bisectors.
Start the GeoMaster application.
1. Press
nto display a list of applications on your calculator.
2. Select
GeoMastr. The information screen is displayed.
Tip
After you press n, you can press eG to move to the first
application name that begins with a G.
3. Press any key to continue. The main screen is displayed.

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Draw a triangle.
1. Select
DRAW (press S) to display the drawing menu
options.
2. Select
Triangle
(move the cursor to Triangle, and then press
¯, or press 5, the number that corresponds to Triangle).
3. Use the arrow keys to place the cursor where you want the
first point of the triangle to start, and then press ¯.
4. Use the arrow keys to move the cursor away from the point.
The first segment is drawn.
5. Press
¯to create the second point and complete the first
segment.
6. Move the cursor away from the second point. The second
segment is drawn.
7. Press
¯to create the third point and complete the
second segment.

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8. As you draw the second segment, the last segment of the
triangle is automatically drawn. To complete the triangle,
move the cursor away from the third point.
Draw perpendicular bisectors of two sides of the triangle.
1. Press
Vto display the menu bar across the bottom of
the screen.
2. Select
DRAW, and then select Perp Bisector.
Tip
You can press the number (or eplus the letter) that
corresponds to the menu item to select it. For example, to select
Perp Bisector, you can press eH.
3. Use the arrow keys to move the cursor to one side of the
triangle, and then press ¯. The perpendicular bisector of
that segment is drawn.
Note
You must move the cursor to within two pixels of the triangle
segment to draw the perpendicular bisector.

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4. Use the arrow keys to move the cursor to another side of the
triangle, and then press ¯. The perpendicular bisector of
that segment is drawn.
Find the intersection point of the perpendicular bisectors.
1. Press
Vto display the menu bar.
2. Select
DRAW, and then select Intersection.
3. Use the arrow keys to move the cursor to one perpendicular
bisector, and then press ¯.

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4. Use the arrow keys to move the cursor to the other
perpendicular bisector, and then press ¯. The
intersection point is drawn.
Draw a circle that circumscribes the triangle.
-The center point is the intersection of the perpendicular
bisectors.
-The circle intersects each vertex of the triangle.
1. Press
Vto display the menu bar.
2. Select
DRAW, and then select Circle.

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3. Use the arrow keys to move the cursor to the intersection
point of the perpendicular bisectors and press ¯.
Note
When more than one object is near the cursor location, a dialog
box displays a list of objects that you can choose. Each object is
named according its object type. A number follows the name,
indicating the order in which that object was created. For
example, Point 11 is the name of the 11th point created in this
drawing, which is the intersection point of the perpendicular
bisectors. Move the cursor to the correct object name and press
¯to select it.
4. Use the arrow keys to move the cursor to one of the vertex
points of the triangle. The circle enlarges as the cursor
moves. Press ¯at the vertex point to complete the
circle.
There are 2 objects at this cursor
location. Point 11 is the intersection
point of the perpendicular bisectors.