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Trojuholníková nerovnosť
[b][color=#c51414]Meňte dĺžky strán trojuholníka pomocou posuvníkov a skúmajte, kedy sa dá trojuholník skonštruovať.[/color][/b]
Skúmajte a porovnávajte súčty dvoch kratších strán so stranou treťou.