Consider various GSP tools.
By Na Young
:Given a triangle , the triangle whose vertices are endpoints of the
altitudes from each of the vertices of is called the orthic triangle,
or sometimes the altitude triangle.
10. Pedal triangle
: Given a point P, the pedal triangle of P is the triangle whose polygon
vertices are the feet of the perpendiculars from P to the side lines.
: It is the midpoint of the line between the circumcenter and orthocenter.
: The nine-point circle, also called Euler's circle or the Feuerbach
circle, is the circle that passes through the feet of the perpendicular,
and dropped from the vertices of any triangle on the sides opposite
13. Trisecting a line segment: We use the Centroid divide
a segment from a vertex to an opposite side a ratio 2:1
Make a circle by given a radius and in a coordinate system,
Rotate 108 degrees.
Using Rotate by 60Õ
Using Rotate by 36Õ