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A point is an exact location.
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A line neverending straight path.
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Segment: Part of a line containing two endpoints and all the points between them.[image]
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Ray: A part of a line that extends indefinitely in one direction from a fixed point.
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Plane: A twodimensional flat surface that extends in all directions.
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Opposite Rays : Two rays that are part of the same line and have only their endpoints in common.
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Collinear: Three or more points that lie on the same line.
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Coplanar: Points or lines that lie in the same plane.
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Angle: A figure formed by two rays with a common endpoint.
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Midpoint: On a line segment, the point that is halfway between the endpoints.
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Bisector: A ray that separates a given angle into two angles with equal measure.
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Congruent: Having the same measure.
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Vertex: The common endpoint of the rays forming the angle.
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Acute Angle: An angle with a measure greater than 0° and less than 90°.
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Obtuse Angle: An angle that measures more than 90° but less than 180°.
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Right Angle: An angle that measures exactly 90°.
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Straight Angle: An angle that measures 180°.
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Definition
Complementary Angles: Two angles are complementary if the sum of their measures is 90°.
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Supplementary Angles: Two angles are supplementary if the sum of their measures is 180°.
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Vertical Angles: Opposite angles formed by the intersection of two lines.
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Adjacent Angles: Angles that have the same vertex, share a common side, and do not overlap.
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Linear Pair: two angles that are adjacent whose angles add up to 180.
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Perpendicular Lines: Lines which meet to form right angles and whose slopes have a product of 1.
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Polygon: A simple closed figure in a plane formed by three or more line segments.
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Convex: A polygon for which all diagonals are located in the interior of the polygon.
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Concave: A polygon for which a point on at least one of its diagonals lies outside the polygon.
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Regular Polygon: A polygon that has all sides congruent and all angles congruent.
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Irregular Polygon: A polygon that has all sides aren't congruent and all angles aren't congruent.
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Diagonal: A segment joining two nonconsecutive vertices of a polygon.
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Side: The segments that form a closed figure.
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Perimeter: The distance around a closed geometric figure.
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Triangle: A polygon having three sides.
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Quadrillateral: A polygon having four sides.
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Pentagon: A plane figure with five straight sides and five angles
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Hexagon: A plane figure with six straight sides and angles.
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Octagon: A plane figure with eight straight sides and eight angles. 


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Decagon: A plane figure with ten straight sides and angles.
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Dodecagon: A plane figure with twelve sides.
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Ngon: a term where n is the number of the polygon's sides, also it could be used to name a polygon. For example, a polygon with 15 sides is a 15 gon.
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