Prawokutny třiróžk je třiróžk, kotry ma jedyn kut prawy.
Strona prawokutneho třiróžku znapřeća prawokutej so mjenuje hypotenuza, strony při prawokuće so mjenuju katety.
Zwisk mjez dołhosćemi stronow prawokutneho třiróžka wopisuje sada Pythagorasa.
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