###
parallel lines

a line in a plane that never intersect

###
convex

diagonals do not have any points outside the polygon

###
concave

one or more diagonals have points outside the polgon

###
diagonal

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

###
regular polygon

a polygon with all sides and all angles congruent

###
polygon

a closed plane figure made of the line segments

###
alternate exterior angles

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

###
congruent segments

segments that are equal in length

###
midpoint

a point that divides a line segment onto two congruent segemts

###
straight angle

an angle that measures 180

###
obtuse angle

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

###
acute angle

an angle that measures less that 90

###
right angle

an angle that measures 90

###
perpendicular lines

lines that intersects to form right angles

###
segment bisector

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

###
perpendicular bisector

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

###
congruent angles

angles that have the same size and shape

###
angle bisector

the ray that divides a given angle onto 2 congruent angles

###
complementary angles

2 angles whose measures have a sum of 90

###
supplementary angles

2 angles whose measures have the sum of 180

###
adjacent angles

2 angles that are in the same plane

###
vertacile angles

2 congruent angles formed by intersecting lines

###
transversatle

a line that intersects 2 or more lines at different points

###
corresponding angles

a pair of non-adjacentangles

###
alternite interior angles

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

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