Texas Instruments TI-73 Explorer Manual

TI-73 Geoboard

Getting Started

Start Here…

How To…

Work with Boards Transform Objects

Create and Delete Objects Measure Objects

Save and Share Boards

Examples

Creating Regular Polygons

Rotating to Create Patterns

Examining Areas of Squares

More Information

Troubleshooting

Customer Support

TI-73 Geoboard Page 2

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

the purchase price of this product. Moreover, Texas Instruments

shall not be liable for any claim of any kind whatsoever against

the use of these materials by any other party.

Apple, Macintosh, Microsoft, and Windows are trademarks of their respective owners.

TI-73 Geoboard Page 3

What is Geoboard?

Geoboard is a Flash software application for the Texas

Instruments TI73 graphing calculator. It gives you an electronic

geoboard on which you can form geometric objects. You can

then manipulate and examine the objects.

You can:

•Draw objects on square or circular boards.

•Rotate, reflect, and translate objects.

•Measure lengths, areas, perimeters, and angles.

•Store measured values in TI73 lists for plotting and analysis.

•Show or hide labels, axes, and coordinates.

•Save Geoboards so you can retrieve them later.

TI-73 Geoboard Page 4

What You Will Need

To install and run TI73 Geoboard, you need:

•A TI73 with version 1.3007 or later of the Graph Explorer

software. (To check the version, press , and select

About.) To download a free copy of the latest Graph Explorer

software, point your web browser to

http://education.ti.com/

•At least 1000 bytes of available TI73 RAM memory and:

-An additional 97 bytes for each board that you save.

-An additional 9 bytes for each measured value that you

store in a list.

Geoboard notifies you if you try to save any data after

available memory has dropped below 1000 bytes.

•A PC running Microsoft®Windows®, or an Apple®

Macintosh®.

•The most recent version of TI-GRAPH LINK™ software for the

TI73. To download a free copy of this software,

point your web browser to

http://education.ti.com/

TI-73 Geoboard Page 5

Where to Find Installation Instructions

You can find detailed instructions on installing Flash applications

at this web site:

http://education.ti.com/

Getting Help

If you need help using the calculator, the TI73 guidebook is

available free as a PDF file at:

http://education.ti.com/

TI-73 Geoboard Page 6

Getting Started

After installing TI73 Geoboard on your calculator, you can work

through this exercise to become familiar with the basic features

of the Geoboard application.

In the exercise, you create an irregular four-sided polygon and

use Geoboard commands to measure the polygon’s perimeter

and one of its angles.

Starting with a Square Board

1. Turn the calculator on, and press the key. The

calculator displays a menu of installed applications.

2. Press the number key shown next to Geoboard, or highlight

Geoboard with and and then press the Ekey. The

Geoboard startup screen appears.

TI-73 Geoboard Page 7

3. Press any key to proceed. The Geoboard menu appears,

showing choices for a square board. By default, the 5×5

option is highlighted.

4. Press the

Ekey to select 5×5. The 5×5 board appears

with a small cursor at the lower-left peg and five commands

along the bottom.



The Geoboard

commands are

mapped to the five

TI73 graphing keys.

DRAW=Draw object

TFRM =Transform

FMAT =Format

MEAS =Measure

OPTN =Options

TI-73 Geoboard Page 8

Showing Coordinates and Vertex Labels

1. Select

FMAT (press the key). The FORMAT menu

appears.

2. Press

, , , and as necessary to highlight LblsOn,

and then press the Ekey.

3. Press

, , , and as necessary to highlight CoordOn,

and then press the Ekey.

4. Select

QUIT. The board reappears. The cursor coordinates

are shown, and the vertices of objects that you draw will

have alphabetic labels.

Note

Geoboard creates unique labels for the vertex points of each

object. Even if vertex points of different objects share a common

peg, each vertex point has its own label.

TI-73 Geoboard Page 9

Drawing the Object

A Geoboard object can be a line segment or a closed polygon.

You can create as many as six objects on a board, provided you

do not exceed a maximum of 26 total vertices per board.

1. Select

DRAW (press the key). The commands change to

drawing commands, ADD, DEL, DONE, and QUIT.

2. Press

repeatedly to move the cursor to the top row.

3. Select

ADD to add a point at the cursor position.

4. Press

. As the cursor moves, it leaves a dotted line

to show the new portions of the object that you are drawing.

5. Select

ADD to add a second point. The dotted line becomes

solid.

6. Press

, and then select ADD to add a third point. You

now have a triangle.

7. Press

, and then select ADD to add a fourth point.

TI-73 Geoboard Page 10

8. Select

DONE. Your four-sided object looks like this:

9. Select

QUIT. The main Geoboard commands reappear.

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