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Created Using
Dynamic Geometry
GeoGebra
http://www.geogebra.org/
Lesson 1, drawing a triangle, firstly I am going to set this up so it close the points only on they interfere values on the access. So you go up to options, point capturing and I am going to say on to the grid. Just make lot of easier a little bit easier and a bit meter.
Now to draw a triangle we need 3 points so 1, but you can see when I do the points even though this 3.7, 6, 5.2 I am going to put the point down and move it to 4,5. So the order of this corners all this vertices on track on they can just in varies.
Now we need a triangle, so we need to draw a polygon. We go to this, one we look down, select a polygon and then join up the points in the same order. Going back to A to finish and it draws up a polygon. Vertices a side A opposite, vertices B, side vertices C, side C. A polygon is that and we can move it around and there we go. We can see as you learn the corner and it change, these are the links with the sides and that there is the area of that particular polygon. We can show the areas on that as well. Select area, select polygon, there it is, I just move it down there and now we can explore happens in the area when we came to shape. We move C, we notice that the area does not change. So we can use this to explore what happen through this sides move B over the area does change.
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