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April 2010: Calendar of Events:
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GeoGebraNA: GeoGebra North America – Teachers welcome too. Bring your children 10-15. Write me with questions – I will be there.
Other GeoGebra Events
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New eLearning Module – DIY Free Fall with Constant Horizontal Velocity – An Algebra 1/Algebra 2 exercise from Dani Novak, David Cox and LFS.
Complete with Good Questions and DIY Applet Directions and Screencast of in-class lesson.
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New eLearning Module – Quadratic Inequalities – An Algebra 2 exercise from Royati Saha and LFS. Complete with Good Questions
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UPDATED eLearning Modules: Vertical Motion Discriminant DIY Simulators: Car Race 1 Car Race 1 Plus Car Race 2 Left Riemann Sums
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Tips in YouTube Videos:
Scale and Label the Axes - GeoGebra Quickie
Learn how to scale and label the axes so that you can solve problems from real life geometrically with GeoGebra.
Free Points on the Axes - GeoGebra Quickie
Free Points, Semi-Free Points and Dependent Points - GeoGebra Quickie. Find out how to create free points that are on the axes.
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A Portent of Things to Come – GeoGebra 4.0
For those of you wanting to have input buttons inside of GeoGebra |
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Date: July 2009 - Soccer Goal Simulator 1
- Complete Interactivity for 6th grade and up
A Ready-to-Use Simulator InterActivity and A Build Your Own Simulator Kit
Materials include ready-to-use simulator, complete introduction to problem, construction steps and images for building simulator, good mathematics questions, educator's pages with complete illustrated answers - all in pdf and doc format. Zip includes everything for offline use.
Statement of the Problem: A soccer player is running down the field in straight line parallel to the sideline. Where is he when the angle for making a goal is at a maximum?
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Date: January 2009 -Vertical Motion
Height as a quadratic function of time: 
- Now allows: 0<h0<1000 and -100≤v0<100 and either [ft] or [m]
A great activity for physics too!
Download 
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Date: January 2009 - Lesson 1 - GeoGebra/Javascript for the complete beginner
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Date: January 2009 - Lesson 2 - GeoGebra/Javascript for the complete beginner
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Date: 17 December 2008 - Inequalities on the Number Line - updated Jan2009
User interacts in different ways with inequalities on the number line!
Level: 7th grade and up - Number Sense / Algebra and Functions
Keywords: inequality, number line, numberline, graphing, intersection
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Date: 03 December 2008 - Graphing of Linear Inequalities in 2 Variables - Region in the Plane
User interacts in different ways with inequalities in 2 variables in the plane.
Available for download: offline use and school version.
Level: 8th grade and up - Algebra 1
Keywords: lines, linear inequation, inequality, shading, plane, graphing, intersection
Revised: January 2009
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Date: 04 November 2008 - Systems of Linear Equations 2x2: Complete InterActivity for Boat in River Current
Understanding the boat in river current problem (standard 2x2 linear system from real-life). Choose the speed of the boat in still water, the speed of the current and the direction of the boat. Then animate and check what happens. Change the direction of the boat and re-animate.
Complete interactivity with simulator, student worksheet, teacher guide and answer sheets and including a review of 2x2 linear systems. Available for download and offline use.
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Date: 03 November 2008 - Lesson 14 Reduced Fractions and Coefficients
This lesson is on how to present reduced fractions and coefficients with GeoGebra
screencast geogebra fractions coefficients
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Date: 09 September 2008 - Algebra and Functions with GeoGebra
Car Race Activity: Slopes and Intercepts
Choose the speed and starting point of red and blue car and then race them.
Activity connects speed and starting position with slope and y-intercept.
Many activities are possible and files for offline use are coming (waiting for GeoGebra 3.1 to be released :)).
If you have ANY SUGGESTIONS about this activity or how to use it in a classroom, please write me! emath@emathforall.com
Main Page for SLOPE: mathcasts.org/mtwiki/GlossaryT/Slope
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Date: 27 August 2008 - Interactivities with GeoGebra
Compass and Straightedge: Constructing with GeoGebra
Interactivities, Examples, Problems and more ...
mathcast geogebra construct compass straightedge interactivity activity
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Date: 25 August 2008 - Learn and Use GeoGebra 3 - Lesson 13
Lesson 13 Animating your GeoGebra Activity - It is easy!
This lesson shows how easy it is to add animation to your GeoGebra activity
screencast geogebra animate animation
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Date: 1 August 2008 - Learn and Use GeoGebra 3.1 - Lesson 12
Lesson 12 Fitting a Curve to an Image
This lesson demos some of the new features of GeoGebra 3.1 (pre-release). You can do everything in GGB3 except fit the curve to the points since the FitLine function is a NEW feature in GeoGebra 3.1.
screencast geogebra image scatterplot fitcurve least squares
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Date: 26 April 2008 - Learn and Use GeoGebra 3 - Lesson 11
Lesson 11 Polygons and Translation, Checkboxes
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Date: 01 February 2008 - Measurement and Geometry with GeoGebra
Activity 3 - Triangles, Medians and Right Triangles
Fact: If the median (line joining vertex and midpoint of opposing side) is half the length of that side, then the triangle is a right triangle.
User interacts with construction and notes that the triangle "appears" to be a right triangle. Then, using only the fact that the lower angles of an isosceles triangle are equal, the user "proves" that the angle is in fact 90°. Finally, user constructs the same interactivity.
Materials include handout for student and teacher page (in pdf and doc format), ggb files for offline use and/or interactive page for online use.
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Meta Data for Activity 
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Date: 18 January 2008 - Physics with GeoGebra
Center of Mass (Centroids) - Triangles
6 Interactivities for Learning about Centroids of Triangles
- What's a median of a triangle?
- What's special about medians of triangles?
- Exploring Centroids
- Interact with Ceva's Theorem
- Six triangles with equal area that don't look alike at all!
- 2/3 and 1/3 - how is that possible?
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Date: 10 January 2007 - Algebra with GeoGebra
Learning Slopes - reworked and expanded
Use GeoGebra to test your skills with finding slopes and linear equations.
Zip with Menu and all 5 Activities - Internet (School) & Totally Offline
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Meta Data for Activity
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Date: 6 January 2008 - K-7 Measurement and Geometry with GeoGebra
Activity 2 - Measuring and Drawing Random Angles
Each level allows student to generate random angles, measure or draw angle
and check answer ...
Standalone Zip with instructions and all 12 Measuring & Drawing Activities
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Meta Data for Activity
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Date: 21 November 2007 - Vectors and Matrices with GeoGebra
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A new section! |
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Date: 17 November 2007 - Learn and Use GeoGebra
Boat Landing Problem 1 - Using GeoGebra to Simulate Real Problems
An interesting problem made accessible for 8th-10th graders using GeoGebra.
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Problem setting: A man with a boat at point S at sea wants to get to point Q inland. Point S is distance d1 from the closest point P on the shore, point Q is distance d2 from the closest point T on the shore and point P and T are at a distance of d.
Question: If the man rows with a speed of vr and walks with a speed of vw at what point R should he beach the boat in order to get from point S to point Q in the least possible time?
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Date: 29 October 2007 - Calculus with GeoGebra
Boat-Landing Problem
This cool problem can be explored in 8-10th grade (see above) and then solved mathematically in calculus!
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Date: 29 April 2007 - Physics with GeoGebra
Activity 3 - Firing the Cannon - Tilting Cannon
A bit more fun for the user: Learning in this activity: User can set the angle and watch the cannon tilt, the height and the initial velocity and then fire the cannon, follow the trajectory of the cannon ball and have it explode (and see the equations and the data).
--- Developers: This is an animated GeoGebra Activity with appearing and dissapearing objects and a rotating object - see GeoGebra Starters. |
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Date: 19 April 2007 - Activities with GeoGebra
Activity 4 - Measuring Length:
Many times the young ones don't understand how to measure with a ruler! Use these activities to help them see and do!
Guided Activity: Ladybug Walks the Width - Learning to Measure
- a set of 6 guided interactive activities to understanding measuring length - for 2nd - 3rd grader
- Try it! - Demo Screencast - Download zip (includes practice)
Practice Activity: Ladybug Walks the Width - Practice NEW!
- practice activity for testing understanding of length - for 2nd - 3rd grader
- Try it! - Demo Screencast - Download zip
Simple & Small: Interactive Length Measurement Activity for 2nd - 5th Graders!
- Try it!
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Date: 16 April 2007 - Activities with GeoGebra
Activity 3 - Perimeters and Areas of Rectangles or standalone download (zip 1MB)
Simple & Small: Interactive Activity for 3-5th Graders!
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Date: 8 April 2007 - Algebra with GeoGebra
Learning and fun with Quadratics*
GeoGebra: Exploring quadratics and parabolas.
*IMPORTANT: To properly view these files, you need to download and install these  TeX-fonts-25.zip to Windows.
To download and use, you will need jsMath and this js file.
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Date: 28 March 2007 - Learn and Use GeoGebra
Lesson 3 - Sliders, Properties, Text
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Date: 28 March 2007 - Physics with GeoGebra
Activity 1a - Firing the Cannon - Exploding Cannonball
A bit more fun for the user: Learning in this activity: User can set the angle, the height and the initial velocity and then fire the cannon and watch the trajectory of the cannon ball and have it explode (and see the equations and the data).
--- Developers: This is an animated GeoGebra Activity with appearing and dissapearing objects so the GeoGebra file is harder to follow than Activity 1 (and still under construction!). |
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Date: 27 March 2007 - Learn and Use GeoGebra
Lesson 4 - Inputs and Disappearing Objects
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Date: 25 March 2007 - Physics with GeoGebra
Activity 1 - Firing the Cannon
Learning in this activity: User can set the angle, the height and the initial velocity and then fire the cannon and watch the trajectory of the cannon ball (and see the equations).
--- This is an animated GeoGebra Activity!
(still under construction - the ball journeys to the center of the earth ... - but a bit of fun!) |
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Date: 21 March 2007 - Geometry with GeoGebra
Activity 4 - Constructing Parallelograms
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Date: 10 March 2007 - GeoGebra Starters
JavaScript GeoGebra Functions
- Javascript functions for interaction between the html with the ggb file.
- Javascript functions for generating random values for slope, angles, etc.
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Date: 7 March 2007 - Learn and Use GeoGebra
Lesson 9 - Auxiliary Objects, Format Paint, Polar Coordinate Graph (see Geogebra Starters)
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