This exercise guides students through an exploration of theorems involving parallel, perpendicular and transversal lines. The step-wise approach also allows students to become familiar with the functions available on Geogebra TM, an open domain software and fee app. Students will record findings on handout and also produce a hard copies of Geogebra TM sketches. Subsequent projects and exercises will rely on this introductory use of Geogebra TM.