## Chapter 2 vocab

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melenellen  on September 16, 2009

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# Chapter 2 vocab

 Right anglea 90 degree angle
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#### Definitions

Right angle a 90 degree angle
Obtuse Angle an angle between 90 and 180 degrees
Acute Angle an angle less than 90 degrees
Straight angle an angle equal to 180*
Adjacent angles 2 coplanar angles that share a vertex and a side, do NOT overlap.
Linear Pair Formed by 2 adjacent angles, when their non-shared sides form a straight angle.
Perpendicular 2 line segments/rays intersect to form right angles.
Vertical Angles Non adjacent, non-overlaping angles formed by 2 intersecting lines.
Complements 2 angles that add up to 90*
Supplements 2 angles that add up to be 180*
Triangle Formed by 3 segments with endpoints that are 3 noncollinear points.
Vertices Plural of vertex, Triangles have 3.
Sides Segments that form the triangle.
Polygon a closed plane figure with straight sides
diagonal a straight line connecting any two vertices of a polygon that are not adjacent
consecutive sides sides in a polygon that are connected by a vertex
consecutive angles angles of a polygon that share a side
regular polygon a polygon with all sides and all angles equal
equiangular polygon A polygon with congruent angles
equilateral polygon A polygon with all sides being equal
convex opposite of concave
concave A polygon that can have a line drawn outside the figure (not intersecting with the figure) that can connect two vertices
quadrilateral A polygon with four sides
pentagon A polygon with 5 sides

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