The figure shows the vertical angles BAC and DAE. F and G are the orthocenters of trianglers ABC and ADE, respectively. If M and N are the midpoints of BE and CD, respectively, prove that MN and FG are perpendicular.
This step-by-step interactive illustration was created with GeoGebra.
GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus application, intended for teachers and students. Many parts of GeoGebra have been ported to HTML5.
Ten problems: 1411-1420
HTML5 and Dynamic Geometry
View or Post a solution