Creation of this applet was inspired by[url=https://www.geogebra.org/material/show/id/fgdnqeby] https://www.geogebra.org/material/show/id/fgdnqeby [/url]posted by Oktay Haracci — 27. Mai 2019 - 08:17   . How can you prove what this applet illustrates? [br]From the point of view of Steiner's theorem, the result is obvious. Calculations within the applet.