Answered
In a Right angle triangle ABC
AB=3,AC=4 & BC=5
at BC,E is middle point and D is altitude AD
Find distance DE=?
it is not a difficult question everyone who know maths can solve easily but question is solve it in one line...........
The same question 
This is not exactly a GeoGebra request...
btw have a look at triangles BDA and BAC. They are similar (same angles), so the corresponding sides are proportional, e.g.
BD/AB = AB/BC
Solve this for BD and it's done.
As per U sir it is RIGHT AB^2=BD.BC
(3)^2=BD(5)
9/5=BD
BD=1.8
DE=2.6-1.8=.7
BUT SIR IT IS FIVE LINE
I WANT IN SECONDS IN ONE LINE.
SIR recently a new theorem introduced ...........
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