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NL 2010 03 24

Page history last edited by LFS 9 years, 8 months ago

Home -> Newsy Letters ->2010 March 24


March 24 2010

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New Learning Module - Completing the SquareAn Algebra 2 exercise from Terry Gastauer.

    http://geogebrawiki.pbworks.com/CompleteSquare   Send your feedback - particularly for/with good questions!

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Tips :  These first 2 tips are used in the above learning module. (Nothing to do with completing the square  :) )

Navigate to the link and then click on the + to open the GeoGebra InterActivity.

Select the checkbox “Show Areas”. Then, click and drag the sliders. Notice that the text stays at the midpoint of the sides/ center of the quadrilaterals.

 

Easy: Putting a text object at the midpoint of a dynamic line.

     Your line “a” is dynamic (no matter whether animated or just click and drag vertices).

     You want the text “text1” to always be at the midpoint.

     Create your text. Now right-click on it and chose “Object properties” from the drop-down menu (at bottom).

     Click on the Position tab. (Tabs are Basic, Text, Color, Position, Advanced)

     Type in Midpoint[a]      (Use []  - Midpoint is a GeoGebra command.)  You can also use Midpoint[A,B], where A and B are points.

     You can use the Select tool to position it around the midpoint (e.g. so that it is not on the line itself). GeoGebra will remember this.

 

Easy: Putting a text object in the center of a dynamic polygon.

     Your polygon “poly1” is dynamic.

     You want the text “text1” to always be centered.

     Create your text. Now right-click on it and chose “Object properties” from the drop-down menu (at bottom).

     Click on the Position tab.

     Type in Centroid[poly1]      (Use []  - Centroid is a GeoGebra command.)

     You can use the Select tool to position it around the centroid (e.g. so that it is not on the grid). GeoGebra will remember this.

   

       

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LaTeX tips – my thanks to Prabir Chandra

  1. Important tip for LaTeX text: If your LaTeX text ends with a GeoGebra object ALWAYS add +”” to the end of the definition.

        (BTW: This is a good tip for ANY text, not just LaTeX. GeoGebra likes text to end in text.)

Example: "a="+a+""

 

  2.  Easy: Put a box around your LaTeX formula  2010-03-24.ggb 

Create a Latex formula   (the  \, are half-spaces – see the 2nd image below).

 

Carefully navigating the quotes, put the latex command \fbox{  }  around your whole formula

 

 

   3.  Hard: Finally – if you like LaTeX and you are wanting to do something more with fractions than FractionText[], have a look at this ggb: fractions_display.ggb

            (If you want more explanation for this, write me.)

 

Happy teaching with GeoGebra, Linda

 

Send me your tips and tricks!


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