Definitions
Collinear: three points that all lie on a single line
Rotation of rays: the collection of all possible rays emanating from a single point
Midpoint: divides the line segment into two equal parts
Complementary: the sum of two angles is 90
o
Supplementary: the sum of two angles is 180
o
Linear pair: two angles with a common side and their sides are opposite rays
Vertical angles: two angles with the sides of one angle are opposite rays of the sides of
the other.
Congruence: two objects can lie on each other exactly if moved by rigid motion or a
correspondence b/t objects preserving lots of good properties
Polygon: Set of line segments so that each line segment intersects exactly two others, one
at each endpoint
Convex: given two points of a polygon, A and B, in the interior of the polygon, the line
segment AB is also contained in the interior
Exterior angle of a triangle: any angle that forms a linear pair with an angle of the
triangle
Transversal: a line passing trough two or more lines at distinct points
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 Spring '06
 MTH
 Angles

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