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Vocab for 7 & 8

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Term
Definition
Interior Angle   an angle formed by two sides of a polygon with a common vertex  
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Auxiliary Line   a line that is added to a figure to aid in a proof  
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Exterior Angle   an angle formed by one side of a polygon and the extension of an adjacent side  
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Remote Interior Angle   an interior angle that is not adjacent to the exterior angle  
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Isosceles Triangle   a triangle with at least two congruent sides  
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Legs   the congruent sides of a triangle  
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Vertex Angle   angle formed by legs  
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Base   side opposite of the vertex angle  
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Base Angles   angles that have the base as a side  
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Equilateral Triangle   a triangle with three congruent sides  
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Equiangular triangle   a triangle with three congruent angles  
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Altitude of a Triangle   a perpendicular segment from a vertex to the line containing the opposite side  
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Centroid of a Triangle   the point of concurrency of the three medians of a triangle. *center of gravity*  
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Circumscribed Circle   every vertex of the polygon lies on the circle  
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Concurrent   three or more lines that intersect at the same point  
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Distance from a Point to a Line   the length of the perpendicular segment from the point to the line  
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Equidistant   the same distance from two or more objects  
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Incenter of a Triangle   the point of concurrency of the three angle bisectors of a triangle  
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Inscribed Circle   a circle in which each side of the polygon is tangent to the circle  
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Median of a Triangle   a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side  
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Orthocenter of a Triangle   the point of concurrency of the three altitudes of a triangle  
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Point of Currency   a point where three or more lines coincide  
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Circumcenter of a Triangle   the point of concurrency of the three perpendicular bisectors of a triangle  
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Midsegment of a Triangle   a segment that joins the midpoints of two sides of the triangle  
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