The $e\psilon-\delta$ definition states that the limit of $f(x) = L$ as $x$ approaches $a$ if for all $\epsilon > 0$, there exists a $\delta > 0$, such that if $|x-a| < \delta$, then $|f(x) - L| < \epsilon$. The applet below courtesy of Sylvain Berube, shows its geometric interpretation.

## Sunday, February 27, 2011

## Friday, February 25, 2011

### Grapher

Instruction: Type the Equation a function in the text box and click the Graph button to graph the function. The step by step in creating this applet can be viewed here.

## Wednesday, February 23, 2011

### Rotation and Area Relationship

- ABCD' is a square. What shape is IJKL? Justify your answer.
- What is the relationship between the area of ABCD' and IJKL?
- Move slider α to the extreme right to verify your answer.

## Tuesday, February 15, 2011

### St. Valentin

Happy Valentines Everyone. Here's an excellent applet created with GeoGebra.

Courtesy of Daniel Mentrard. Ggb file can be downloaded here.

Labels:
geogebra,
GeoGebra animation,
valentines day

## Friday, February 11, 2011

## Saturday, February 5, 2011

### Using the Text Tool

This post is the output of the tutorial that I will post soon. If you want to learn more about GeoGebra, I have created more than 50 tutorials here.

## Friday, February 4, 2011

### AA Similiarty

This applet is for teachers. Feel free to supply the questions/explanations.

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