In this application, we explore the concepts and calculations of rational trigonometry, as introduced In 2005 by Norman Wildberger in his book “Divine Proportions: Rational Geometry for Universal Geometry”. He introduces spreads and quadrants instead of angles and lengths to describe triangles and more. With this concept, all tasks and proofs of Euclidean geometry can easily be carried out without sine and cosine functions and without introducing a differential calculus.