GeoGebra Dynamic Geometry: Orthocenter of a Triangle, Altitudes. HTML5 Animation for Tablets (iPad, Nexus..). Level: School, College, Mathematics Education. Distance learning.

Dynamic Geometry: Orthocenter of a Triangle, Altitudes. HTML5 Animation for Tablets (iPad, Nexus..) Level: High School, College, Mathematics Education

Dynamic Geometry: Orthocenter
The interactive figure above, created with GeoGebra, shows a triangle ABC with the three altitudes AH₁, BH₂, and CH₃ intersecting at a point H, called orthocenter.

To explore (show / hide): tap a check box.
To stop/play the animation: tap the icon in the lower left corner.
To reset the interactive figure to its initial state: tap the icon in the upper right corner.
To manipulate the interactive figure: tap and drag points or lines.

Dynamic Geometry: Orthocenter of a Triangle. HTML5 Animation for Tablets (iPad, Nexus..)

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. It has received several educational software awards in Europe and the USA.