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Từ điển Oxford Advanced Learner 8th
hypotenuse
hypot·en·use [hypotenuse hypotenuses] BrE [haɪˈpɒtənjuːz] NAmE [haɪˈpɑːtənuːs] NAmE [haɪˈpɑːtənjuːz] noun  (geometry)
the side opposite the ↑right angle of a ↑right-angled triangle
Word Origin:
late 16th cent.: via Latin hypotenusa from Greek hupoteinousa (grammē) ‘subtending (line)’, from the verb hupoteinein (from hupo ‘under’ + teinein ‘stretch’).
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