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A line is made up of points and has no thickness or width. 


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A measureable part of line thats consits two points called endpoints and all of the points between them. 


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A plane is a flat surface made up of points the has no depth and extends indefinitely in all directions. 


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points that lie in the same plane. 


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The intersection of two non collinear rays at a common endpoint. 


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The point halfway between the endpoints of a segment. 


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The line that divides something into two equal parts. 


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A triangle in which all of the angles are acute angles. 


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A triangle with an obtuse angle. 


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An angle with a degree measure of 90. 


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Complementary angles.
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Two angles with the measure to have a some of 90. 


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Supplementary angles.
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Two angles with measures that have a some of 180. 


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Two nonadjacent angles formed by two interesting angles. 


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Two angles that lie in the same plane, have a common vertes and side but no interior points. 


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A pair of adjacent angles whose non common sides are opposite rays. 


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Lines that form right angles 


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A closed figure formed by a finite number of coplanar segments celled sides such that the following conditions are met 


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A polygon having 4 sides. 


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A plane figure with five straight sides and five angles 


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A plane figure with six straight sides and angles. 


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A plane figure with eight straight sides and eight angles



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A polygon with ten angles and ten sides 


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.A polygon of 12 angles and 12 sides 


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Concave & Convex.
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Definition
Concave: Curves inward.
Convex: Bulges outword. 


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Regular & Irregular
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Regular: All equal sides.
Irreqular: Non equal sides. 


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A segment that connects nonconsecuive vertices of the polygon. 


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A line bounding a plane figure. 


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The sum of the lengths of the sides of a polygon. 

