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A point is a specific location in space with no size or shape.
[image] 


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A line is a neverending straight path.
[image] 


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A segment is a part of a line containing two endpoints and all the points between them.
[image] 


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A ray is a part of a line that extends indefinitely in one direction from a fixed point.[image] 


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A plane is a twodimensional flat surface that extends in all directions.[image] 


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Opposite rays are Two rays that are part of the same line and have only their endpoints in common. In the figure, [image] and [image] are opposite rays.[image] 


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Collinear points are Three or more points that lie on the same line.[image] 


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Coplanar are Points or lines that lie in the same plane.[image] 


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An angle is a figure formed by two rays with a common endpoint.[image] 


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A midpoint is on a line segment, the point that is halfway between the endpoints. 
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A bisector is ray whose endpoint is the vertex of the angle and is located in the interior of the angle. It separates a given angle into two angles with equal measure.[image] 


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Congruent is Having the same measure.[image] 


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The vertex is The common endpoint of the rays forming the angle.[image] 


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An acute angle is an angle with a measure greater than 0° and less than 90°.[image] 


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An obtuse angle is an angle that measures more than 90° but less than 180°.[image] 


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An right angle is an angle that measures exactly 90°.[image] 


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A straight angle is an angle that measures 180°.[image] 


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Complementary angles are two angles are complementary if the sum of their measures is 90°.[image] 


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Supplementary angles are two angles are supplementary if the sum of their measures is 180°.[image] 


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Vertical angles are opposite angles formed by the intersection of two lines.[image] 


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Adjacent angles are Angles that have the same vertex, share a common side, and do not overlap.[image] 


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Linear Pairs are Two angles that are adjacent and supplementary.[image] 


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Perpendicular lines are lines which meet to form right angles and whose slopes have a product of 1.[image] 


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A polygon is a simple closed figure in a plane formed by three or more line segments.[image] 


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A concave polygon is a polygon for which a point on at least one of its diagonals lies outside the polygon.
[image] 


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A convex polygon is a polygon for which all diagonals are located in the interior of the polygon.[image] 


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A regular polygon is a polygon that has all sides congruent and all angles congruent.[image] 


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Any polygon that is not a regular polygon. A irregular polygon is a polygon whose sides are not all the same length or whose interior angles do not all have the same measure.[image] 


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A diagonal is a segment joining two nonconsecutive vertices of a polygon. [image] 


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A side is the segments that form a closed figure.[image] 


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The perimeter is the distance around a closed geometric figure.[image] 


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A triangle is a polygon having three sides.[image] 


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A quadrilateral is a polygon having four sides.[image] 


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A Pentagon is a polygon with five sides.[image] 


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A hexagon is a polygon with six sides. [image] 


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A octagon is a polygon with eight sides. [image] 


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A decagon is a polygon with ten sides. [image] 


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[image]A Dodecagon is a polygon with 12 sides. 


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A ngon is polygon with n sides.[image] 

