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Measurement and Geometry with GeoGebra - Step-by-Step to Math 
== You do NOT need to install GeoGebra to use these files === but it's free and great so here's the link: Get GeoGebra
== You do need the standard JavaSun Player to use these files === it's free too.
GeoGebra-Math247 (Links to all GeoGebra resources on this site.)
Latest posts - Activity 3 - Triangles, Medians, Right Triangles
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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Activity 2 - Measuring and Drawing Angles
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Each level allows student to generate random angles, measure or draw angle
and check answer ...
Standalone Zip with instructions and all 12 Levels for Measuring & Drawing Activities
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Activity 1 - Perimeters and Areas of Rectangles
Simple & Small: Eight Interactive Activities for 3-5th Graders!
The young ones can move the points and watch the perimeter and area change and then do some calculations themselves!
Stand-alone download (zip  )
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GeoGebra Menus
- Lists of open menus wiith tool-icon and commands positions
in a handy two-page handout - pdf format.
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How to copy the link
- Right-click on "Do the Lesson!"
- Select "Copy link location
- Go to where you want to paste the link
- Right-click and select "Paste"
How to use zipped files
- One-time
- Make a new folder.
- Download: Images_etc.zip (zip of images and geogebra-javascript files)
- Unzip this file into your new folder.
- Each lesson
- Download the zipped file of the lesson you want.
- Unzip it into this same folder (automatically creates subfolders)
Math247 GeoGebra (links to all GeoGebra resources on this site) Got something special you want to see or show? Contact me.
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