Nós, R.L. and Lago, R.C. 2020. Investigando teoremas de geometria plana com o GeoGebra <br> Investigating plane geometry theorems with GeoGebra. Journal of the GeoGebra International Institute of São Paulo. 9, 3 (Dec. 2020), 15–29. DOI:https://doi.org/10.23925/2237-9657.2020.v9i3p015-029.