In many technical fields, it is necessary to have a basic set of mathematical skills. Engineers need to calculate and understand concepts. They have to know how to solve equations, analyse measurements, use tables and graphs for some processes. These are just some examples showing how mathematics learning is important. For better illustration and visualization of mathematical concepts and methods, it is appropriate to use a modern technology. This provides dynamic teaching opportunities in math classes. GeoGebra is a free math software that is very useful for this purpose. This article shows some practical examples of the GeoGebra usage both as in mathematics education and as a support in solving technical problems.