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### 17 Cards in this Set

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 intersect To have one or more points in common. intersect glossary midpoint the point that divides or besects a segment into two congruent segments. angle bisector a ray that divides an angle into two adjacent angles that are congruent perpendicular lines Two lines that intersect to form a right angle perpendicular bisector a segmant, ray, line, or plane that is perpendicular to a segmant and its midpoint perpendicular bisector of a triangle a line, ray, or segmant that is perpendicular to a side of a trianlge at the midpoint of the side concurrent lines 3 or more lines that intersect in the same point circumcenter of a triangle the point of concurrency of the perpendicular bisectors of a triangle angle bisector of a triangle a bisector of an angle of the triangle incenter of a triangle the point of concurrency of the angle bisectors of the triangle Median of a triangle a segmant whos endpoints are a vertex of the triangle and the midpoint of the opposite side. centroid of a triangle the point of concurrency of the medians of a tiangle altitude of a triangle the perpendicular segment from a vertex of a tiangle to the opposite side or to the line that contains the oppisite side orthocenter of a triangle the [pmt pf concurrency of the lines containing the altitudes of a tiangle midsegmant of a triangle a seg,emt that connects the midpoints of two sides of a triangle indirect proof a proof in which you prove that a statement is true by first assuming that its opposite is true. if this assumption leads to an impossibility then you have proved that the original statement is true.