Exercise 1
http://www.geogebratube.org/material/show/id/34862 (Download GeoGebra file)
Exercise 2
http://www.geogebratube.org/material/show/id/35023 (Download GeoGebra file)
Exercise 3
http://www.geogebratube.org/material/show/id/35383 (Download GeoGebra file)
Exercise 4
http://www.geogebratube.org/material/show/id/35384 (Download GeoGebra file)
Exercise 5
http://www.geogebratube.org/material/show/id/35385 (Download GeoGebra file)