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Geometry

Unit 2

TermDefinition
Adjacent angles Angles in the same plane that have a common vertex and a common side, but no common interior points.
Alternate exterior angles Alternate exterior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are outside the other two lines.
Alternate interior angles Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are i between the other two lines.
Centroid The point of concurrency of the medians of a triangle.
Circumcenter The point of concurrency of the perpendicular bisectors of the sides of a triangle.
Coincidental Two equivalent linear equations overlap when graphed.
Complementary angles two angles whose sum is 90 degrees
Congruent figures figures that have the same size and shape.
Dilation Transformation that changes the size of a figure, but not the shape.
Equiangular The property of a polygon whose angles are all congruent.
Equilateral The property of a polygon whose sides are all congruent.
Exterior angle of a polygon An angle that forms a linear pair with one of the angles of the polygon
Incenter The point of concurrency of the bisectors of the angles of a triangle.
Intersecting Lines Two lines in a plane that cross each other. Unless two lines are coincidental, parallel, or skew, they will intersect at one point.
Intersection The point at which two or more lines intersect or cross.
Inscribed polygon A polygon is inscribed in a circle if and only if each of its vertices lie on the circle.
Linear pair Adjacent, supplementary angles. Excluding their common side, a linear pair forms a straight line.
Median of a triangle A segment is a median of a triangle if and only if its endpoints are a vertex of the triangle and the midpoint of the side opposite the vertex.
Midsegment A line segment whose endpoints are the endpoint of two sides of a triangle is called a midsegment of a triangle.
Orthocenter The point of concurrency of the altitudes of a triangle.
Plane One of the basic undefined terms of geometry. Traditionally thought of as going on forever in all directions (in two-dimensions) and is flat (i.e., it has no thickness).
Proportion An equation which states that two ratios are equal.
Ratio Comparison of two quantities by division and may be written as r/s, r:s, or r to s.
Regular polygon A polygon that is both equilateral and equiangular.
Remote interior angles of a triangle the two angles non-adjacent to the exterior angle
Same-side interior angles Pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are between the other 2 lines. When the two other lines are parallel, same-side interior angles are supplementary.
Same-side exterior angles Pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are outside the other 2 lines. When the two other lines are parallel, same-side interior angles are supplementary.
Scale factor The ratio of any two corresponding lengths of the sides of two similar figures.
Similar figures Figures that have the same shape but not necessarily the same size.
Skew lines Two lines that do not lie in the same plane ( therefore, they cannot be parallel or intersect.
Supplementary angles Two angles whose sum is 180 degrees.
Transversal A line that crosses two or more lines.
Vertical angles Two nonadjacent angles formed by intersecting lines or segments (also called opposite angles).
Created by: eric.brock