GeoGebra-5.04/C3/Create-action-object-Tools/English

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Visual Cue Narration
Slide Number 1

Title slide

Welcome to the Spoken Tutorial on Create Action Object Tools in GeoGebra.
Slide Number 2

Learning Objectives


In this tutorial we will learn about free and dependent Objects.


We will also learn to,

  • Create a check-box
  • Create an insert button
  • Insert an input box
Slide Number 3

System Requirement

To record this tutorial, I am using;
  • Ubuntu Linux OS version 16.04
  • GeoGebra version 5.0438.0-d
Slide Number 4

Pre-requisites


https://spoken-tutorial.org

To follow this tutorial, learner should be familiar with GeoGebra interface.


For the prerequisite GeoGebra tutorials, please visit this site.

In this tutorial we will use tangents to a circle tool created in the previous tutorial.
Slide Number 5

Code Files

To practise this tutorial you need to download the zip file given in the Code files link.


Extract the downloaded zip file.Locate tangents-circle.ggt file in the extracted folder.

Point to the file on the Desktop.


Right-click and and Open With GeoGebra.

I have already downloaded and extracted the file to my Desktop.


I will right-click on it and Open With GeoGebra.

Click on Tangents to a circle tool >> click two points in the Graphics view.


Point to the tangents to the circle.

Click on Tangents to a circle tool and click two points in the Graphics view.


Tangents to a circle are drawn in the Graphics view.

Cursor on the interface. Now I will explain about Free and Dependent Objects.
Point to the figure. Let us complete the figure.
Click on Intersect tool >> click on points of intersections of the circle and tangents. Click on the Intersect tool.

Mark points of intersection of the tangents to the circle.

Click on Segment tool >> click on A, C >> click A, D >> click A, B. Using the Segment tool we will join A C, A D and A B.
Point to the Algebra view. In the Algebra view, note that segment AC is equal to segment AD.


They are radii of the circle c.

Cursor on the point of contact of tangents and circle Now let's measure the angles at the point of contact of the tangents to the circle.
Click on Angle tool >> click on the points B, C, A.


Click on the points A, D, B.

Click on the Angle tool and click on the points B, C, A.


Then click on the points A, D, B.

Point to the angles. Observe that the angles alpha and beta are 90 degrees.


This is because at the point of contact, tangent to a circle is perpendicular to the radius.

Point to Algebra view.

Click on the arrow triangle next to Algebra.

In the Algebra view, click on the arrow triangle named as Toggle Style Bar.
Click and point to the button and drop-downs. Auxillary Objects, Sort Objects by drop-down and fx drop-down appear.
Click on Sort Objects by drop-down.

Point to the menu.

Click on Sort Objects by drop-down.


Sort by menu opens.

Point to the check-boxes. This menu has,

Dependency, Object Type, Layer and Construction Order check-boxes.

Point to Object Type check-box.


Select Dependency check-box.

By default, Object Type check-box is selected.


In other operating systems a different check-box may be selected.


Let us select Dependency check-box.

Under Free Objects point to points A and B.


Point to all other objects under Dependent Objects.

Note that only points A and B are under Free Objects.


All other objects are under Dependent Objects.

Click and show the check-boxes. You can select other check-boxes and see how the objects are sorted.
Cursor in the Graphics view. Now we will learn how to create a check-box.
Click on Check Box tool >> click in the Graphics view.

Point to the dialog box.

Click on the Check Box tool and click in the Graphics view.


Check Box to Show/hide Objects dialog box opens.

Point to the Caption text box.

Type Angles

In the Caption text box, I will type Angles.
Point to Select objects in construction or choose from list.


Click on Apply button in the box.

From the Select objects drop-down, let us select Angle alpha and Angle beta.


Then click on Apply button in the box.

Point to the check-box. Angles check-box appears in the Graphics view.
Click on Move tool. Let us click on Move tool to avoid clicking of other objects in the Graphics view.
Point to the check-box in the views. Angles check-box is shown as a Boolean Value a in the views.
Check and uncheck the Angles check-box. Using this check-box, we can show or hide the angles alpha and beta.
Point to the Boolean value in the Algebra view. In the Algebra view, Boolean Value is true when the angles are shown.
Click on Angles check-box to show or hide the angles. Boolean Value becomes false when they are hidden.
Cursor on Geogebra interface. Now we will insert an input box.
Click on Input Box tool >> click in the Graphics view. Click on the Input Box tool and click in the Graphics view.
Point to Input Box. Input Box appears in the Graphics view.
Type Caption as Circle. In the box, type the Caption as Circle.
Point to Linked Object drop-down.

Select circle c>> click OK.

In the Linked Object drop-down, select circle c.

And click on OK button in the box.

Point to the input box. Circle input box, along with its coordinates, appears in the Graphics view.
Click on Move tool. Click on Move tool to select it.
Type B in place of A >> press Enter.


Point to tangents and related objects in the Algebra and Graphics views.

In the input box, type B in place of A and press Enter.


The tangents, angles and all related objects disappear.


Position of the circle has also changed


This happens because all the objects are dependent on point A.

Slide Number 6
Assignment
As an assignment,

In the circle input box change (A,B) to (B,A) and (A,A) and see what happens.

Explain your observation.

Click on Undo button. Click on Undo button to undo the changes

Cursor on the interface.

Now, we will learn how to create a button.
Click on Button tool >> click in the Graphics view. Click on the Button tool and click in the Graphics view.
Point to the dialog box. The Button dialog box opens.
Type Caption as Value. Type Caption as Value.
In GeoGebra Script box type,

SetValue[A, A-1]

SetValue[B, B+2]

SetColor[j, "Blue"]

SetColor[h, "Green"]

SetColor[i, "Red"]

In GeoGebra Script box type the following script.


Cursor in the GeoGebra Script box Now I will explain the script.
Highlight the line SetValue[A, A-1] This line will change the position of the coordinates of A to A-1


This means that the x coordinate of A becomes x-1 and y coordinate of A becomes y-l.

Highlight the line SetValue[B, B+2] Similarly this line will change the poistion of the coordinates of B to B+2.
Highlight the line SetColor[j, "Blue"] This line will set the colour of segment j to blue.
Highlight the line SetColor[h, "green"] This line will set the colour of segment h to green.
Highlight the line SetColor[i, "red"] This line will set the colour of segment i to red.
Click on OK button. Click on the OK button at the bottom.
Point to the button. Value button appears in the Graphics view.
Click on Value button. Select the Move tool and Click on value button.
Point to the figure in Graphics view.


Point to the coordinates of points A and B.


Point to the segments.

Observe the changes in the Graphics view.


Observe that the coordinates of point A and point B have changed.


The colours of the segments have changed accordingly.

Click on Zoom Out tool.

Then click in the Graphics veiw.

Click on Zoom Out tool and click in the Graphics veiw to zoom out.
Click the value button two more times.


Point Algebra and Graphics views.

I will click the Value button again.


Observe the changes in the coordinates of points A and B.

Slide Number 7

Assignment


As an assignment,

Create a new button.

Write a GeoGebra script to change the colour and position of the points A and B.

Cursor on the interface. Now we will combine action tools and see what happens.
Click on File and New Window. I have opened a new GeoGebra window.
Click on Slider tool >> click in the Graphics view. Click on the Slider tool and click in the Graphics view.
Point to the dialog box. The Slider dialog box opens.
Point to Number radio button. By default, Number radio button is selected with Name as a.


We will leave it as it is.

Type Min as 1>> Max as 10 >> Increment as 1. We will set the Min value to 1, Max to 10 and Increment to 1.
Click OK at the bottom.


Point to the slider.

Click on OK button at the bottom.


A number slider a appears in the Graphics view.

Click on Regular Polygon tool >>click two points in the Graphics view

.

Now click on Regular Polygon tool and click two points in the Graphics view.
Point to the text box.


Type a in Vertices text box >> Click OK button.

Regular Polygon text box opens.


In the Vertices text box, type a and click OK in the box.

Point to Polygon>> poly1 undefined. Notice in the Algebra view, under Polygon

we have poly1 undefined.

Drag slider a from 1 to 10. As a we drag the slider, notice that polygons with different sides appear.
Cursor in the Graphics view. Now we will insert an input box.
Click on Input Box tool >> click in the Graphics view. Click on Input Box tool and click in the Graphics view.
Input dailog box opens.
Type Number of sides in Caption text box. Type the Caption as Number of sides in the box.
Select a=1 in the Linked Object drop-down >> Click OK button Select a=1 in the Linked Object drop-down.


Click on OK button in the text box.

Point to the input box. Number of sides input box appears in the Graphics view.
Click on the blue dot against a=1. In the Algebra view, uncheck the number slider a=1 to hide the slider.
Type 4 in the input box >> press Enter. In the Number of sides input box, type 4 and press Enter.


You will see a square.

Type any number between 3 to 10. Likewise, you can type any number between 3 to 10 and see the respective polygon.
Slide Number

8

Assignment

As an assignment,

Create a check box to show and hide the slider and the input box.

Slide Number 9


Summary

Let us summarise.

In this tutorial we have learnt about free and dependent objects.


We have also learnt to,

  • Create a check-box
  • Create an insert button
  • Insert an input box
Slide Number 10

About Spoken Tutorial project

The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

Slide Number 11

Spoken Tutorial workshops

The Spoken Tutorial Project team conducts workshops and gives certificates.


For more details, please write to us.

Slide Number 12

Forum for specific questions:

Do you have questions in THIS Spoken Tutorial?

  • Please visit this site
  • Choose the minute and second where you have the question.
  • Explain your question briefly
  • Someone from our team will answer them.
Please post your timed queries in this forum.
Slide Number 13

Acknowledgement

Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

This is Madhuri Ganapathi from, IIT Bombay signing off.

Thank you for watching.

Contributors and Content Editors

Madhurig, Nancyvarkey