Koordináta

 https://tananyag.mdoe.hu/mod/book/view.php?id=43&chapterid=264

http://www.shodor.org/interactivate/activities/GeneralCoordinates/

http://www.shodor.org/interactivate/activities/SimpleCoordinates/

https://www.matific.com/hu/hu/home/maths/all-grades/topics/geometry/the-cartesian-plane/