Planimetry
is one of the most problematic
parts of school math, but nevertheless
its teaching has got great importance for students.
It would be dificult to detaily dismantle this whole chapter,
thats why we have oriented our notice in this work on the problematic
of triangels - types of constructions, different models but also some theory.
We tried to fill up soluted triangles with interactive construction which can be
changed by the stroke of user. This is how have we reached higher tablature because
user can see and make different situations of construction without to draw any of it.