[u][b]Khan Academy[/b][/u] is an American non-profit educational organization created by Sal Khan, with the goal of creating a set of online tools that help educate students.Their short lessons produced in the form of videos are a great tool to help learners visualize mathematical concepts. Its website also includes supplementary practice exercises and materials that educators can use in the mathematics classroom. All resources are available for free to users of the website and application.[br][br]In this lesson we will use a number of videos from Khan academy on the following topics:[br][br][list][*]Special properties and parts of triangles[br][/*][*]Perpendicular Bisectors and Circumcenter[/*][*]Medians and the Centroid[/*][*]Altitudes and Orthocenter[/*][*]Euler's line proof [/*][/list][br][b][u]GeoGebra[/u][/b] (made from the two words [b]Geo[/b]metry and Al[b]gebra[/b]) is an interactive geometry, algebra, statistics and calculus application, intended for learning and teaching mathematics and science from primary school to university level. The students will be guided through a number of constructions using this software.[br][br]Lesson constructions with GeoGebra:[br][br][list][*]Circumcenter[/*][*]Centroid[/*][*]Orthocenter[/*][*]Euler's Line[/*][/list][br][b][u]MathXL[/u][/b] is an online homework, tutorial and assessment system from publishing company Pearson. The system includes tutorials that walk students through solving math problems, as well as customizable and editable content for online homework assignments, quizzes and tests correlated to specific standards or objectives as well as to chapters in Pearson’s textbooks. Based on those test results, MathXL also creates personalized study plans for students, with recommendations of tutorial exercises they should focus on. We plan to use the resources related to the lesson topic for additional practice on the content.