# Pre Post for GeoGebra North American 2013

I am going to concentrate on three problems for my two presentations.  Two of the problems are based on orienteering and finding our location using Geogebra with the files below.  The third will be constructing a model in Geogebra that fits the situation of finding the distance between two towers with compass headings and the distance between the to measurements.

These problem work best if you make a video yourself and have students guess where you are based on a location that is familiar to them.  Also your students have a connection to you.  Feel free to use mine, but your students will respond better to their own teacher driving around in the country filming themselves:)

• first file you will need is the sectional maps of southwest Nebraska for my first orienteering problem done on the bus route.

The second file needed is the Cheyenne Sectional for western Nebraska when I filmed by Chimney Rock.

For the third problem you need to watch the video and then use GeoGebra to create a model of the situation.   Again this works best if you take your students out into the country and do it with them.  Place them in teams and make it a competition.  Who’s model will come closest to a measurement from google earth?  Have them write down a guess while you are out in the country.  Who is the best guesser?  Estimation on all problems gives students ownership of the outcome.  Very motivating.