This project is used in my Common Core Geometry class in Chapter 1 to introduce students to the online tool GeoGebra while investigating centroids, orthocenters, circumcenters, and incenters. Students construct each of the centers listed above and then investigate their properties in an acute, obtuse, and right triangle. This resource provides a brief introduction to the button controls on GeoGebra and shows students step by step which buttons (through pictures) to choose to construct the centers. This activity requires the free GeoGebra application to be downloaded on computers. Activity includes student homework assignment that does not require computer access.