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parallel lines

a line in a plane that never intersect

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convex

diagonals do not have any points outside the polygon

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concave

one or more diagonals have points outside the polgon

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diagonal

a line segment, other than a side, that joins two verticles of a polygon

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regular polygon

a polygon with all sides and all angles congruent

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polygon

a closed plane figure made of the line segments

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alternate exterior angles

a pair of non-adjacent exterior angles on opposite sides of the transversal

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congruent segments

segments that are equal in length

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midpoint

a point that divides a line segment onto two congruent segemts

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straight angle

an angle that measures 180

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obtuse angle

an angle with a measure greater than 90 and less than 180

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acute angle

an angle that measures less that 90

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right angle

an angle that measures 90

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perpendicular lines

lines that intersects to form right angles

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segment bisector

any line ray or segment that intersects a segment at it's midpoint

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perpendicular bisector

a line that is perpendicular to a line segment and divides that segments onto 2 congruent parts

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congruent angles

angles that have the same size and shape

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angle bisector

the ray that divides a given angle onto 2 congruent angles

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complementary angles

2 angles whose measures have a sum of 90

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supplementary angles

2 angles whose measures have the sum of 180

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adjacent angles

2 angles that are in the same plane

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vertacile angles

2 congruent angles formed by intersecting lines

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transversatle

a line that intersects 2 or more lines at different points

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corresponding angles

a pair of non-adjacentangles

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alternite interior angles

a pair of non-adjacent interior angles on opposite sides of the transversal

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