The following topics are immediate subtopics of Triangle.

Term: Base (Triangle)
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 Definition: A line or plane in a geometric figure relative to which the altitude of the figure is measured.

Term: Height (Triangle)
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 Definition: l.the length of an altirude. 2. (of a prism), the length of an altitude.

Term: Right Angle
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 Definition: an angle whose measure is 90 degrees

Term: Side
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 Definition: (of an angle) The two rays, hav~ ing a common endpoint, that form an angle.