You can use GeoGebra
to find the Euler Line of a triangle.
GeoGebra
Instruction 1
Algebra View
and Graphics View
under View
in Menu
. GeoGebra
Instruction 3 here. the circumcenter of the triangle,
the centroid of the triangle,
the orthocenter of the triangle,
using the instructions in the appropriate section.
Line
The resulting line is the Euler line of your triangle.