# Working with Expressions

Christopher J. Hoffman shared this question 1 year ago

I created a triangle and three segments that represent the medians of the triangle. I found the distance (length) of the medians which change when I move one of the triangle's vertices. What I want to do is have each of the lengths multiplied by (2/3) and the results change as the vertices are moved. This was a pretty simple task using Geometer Sketchpad, but I can't seem to figure it out using GeoGebra. Any help would be appreciated. completed?

move H over G

Files: foro.ggb 1

this?

Files: foro.ggb 1

Yes, and thank you. It helped. I am curious where a good concise resource is that would provide formula writing instructions. Any ideas? My completed student activity is below.

https://www.geogebra.org/cl... 1

completed?

move H over G

Files: foro.ggb  1

Maybe you are looking for the following:

• Given Point A and S_a
• s_a=Segment(A, S_a)
• S = Point(s_a, 2/3) alternative S=A+Vector(A,S_a) 2/3 (see manual Point())
• s1_a= Segment(A,S) alternative implicit without point S: s1_a=Segment(A, Point(s_a, 2/3))

If you have only the segment s_a without any points and you want only the segment s1_a without points:

• s1_a= Segment(Point(s_a,0), Point(s_a, 2/3))

----------------------------------------------------------