GeoGebra has a built-in spredsheet function. That allows to approximate irregular areas and surfaces of objects in real life.
Students of IES Schaman modelled Island and determined the surface by using spreadsheets in GeoGebra:
- Modelling and caluclating the surface of Canay island - a student video (SP)
- Modelling the island of Lanzarote and calculating its surface - a student video (SP)