25 terms

# CH-10 MATH VOCAB.PART 1

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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