The Mathematical Explorer is an exploration into some of the most interesting mathematics in history and is suitable for anyone who has been intrigued by mathematics and its applications, including hobbyists and students. It contains expository text, illustrations, and interactive examples on a variety of mathematical topics. The treatment of each topic is designed to be educational as well as entertaining; it includes a clear explanation of the important concepts along with fascinating cultural and historical details. The aim of this paper is to inform readers about localization version of this interactive encyclopedia and its availability in slovak language. We will show also some examples concerning to computation of number π from this encyclopedia in this contribution.