How to Find Orthocenter and Altitudes with GeoGebra
You can use GeoGebra to find the orthocenter and altitudes of a triangle.
GeoGebra Instruction 1
- 1.
- Open
Algebra ViewandGraphics Viewunder
Viewin
Menu. - 2.
- Make a triangle with the vertices , and by clicking
Polygon
. Then you need to click on three positions in Graphics Viewwhere you want the vertices of the triangle to be. Finally, complete the triangle by clicking on the point that you started with. - 3.
- Select
Perpendicular Line
. Construct the line from vertex perpendicular to the opposite side . Then, construct the line from vertex perpendicular to the opposite side . Finally, construct the line from vertex perpendicular to the opposite side . These lines are the altitudes. - 4.
- Select
Intersect
by first clicking tool number 2, then tool number 4 in the drop-down list, and click on two of the altitudes to construct the point of intersection between them. This point is the orthocenter.
