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### 15 Cards in this Set

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 circumcenter the point of concurrency of the perpendicular bisectors of a triangle incenter the point of concurrency of the angle bisectors of a triangle centroid the point of concurrency of the medians of a triangle altitude the perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side orthocenter the point of concurrency of the lines containing the altitudes of a triangle concurrent lines three or more lines that intersect in the same point corollary a statement that can be proved easily using a theorem or a definition base angles angles that are on the base of a isosceles triangle skew lines two lines that do not intersect and are not coplanar supplementary complementary adds up to 180 adds up to 90 converse switching the hypothesis and the conclusion 1->2 2->1 inverse the statement formed when you negate the hypothesis and conlusion of a conditional statement <3-> <3