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Geometry Vocab Ch 1 - McDougal Littell
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Gravity
Geometry Vocab Chapter 1 Essentials of Goemetry
Terms in this set (51)
undefined terms
in geometry, the words point, line, and plane
point
has no dimension and is represented by a dot
line
has one dimension, two arrowheads and extends without end
plane
has two dimensions, represented by a shape that looks like a floor but extends without end
collinear
share the same line
coplanar points
points that share the same plane (2 words)
line segment
consists of endpoints and all the points that are between the endpoints
ray
consists of the endpoint and all the points that lie on one side of the endpoint
opposite rays
formed if point C lies on line AB between A and B, describes relationship betweenCA and CB
intersection
the point or set of points that geometric figures share in common
postulate
a rule that is accepted without proof
coordinate
the real number that corresponds to a point on the grid
distance
the absolute value of the difference of two coordinates of real numbers
between
when three points are collinear, you can say that one point is_____the other two
congruent segments
line segments that have the same length (2 words)
midpoint
the point that divides the segment into two congruent segments
bisector
a point, ray, line, line segment, or plane that intersects the segment at its midpoint
angle
an_____consists of two rays with the same endpoint
sides
the rays are the _____of the angle
vertex
the endpoints are the _____of the angle
measure
the _____of an angle is equal to the absolute value of the difference between the real numbers for the rays
acute
measuring between 0 and 90 degrees
right
measuring 90 degrees
obtuse
measuring between 90 and 180 degrees
straight
measuring 180 degrees
straight
measuring 180 degrees
congruent angles
angles that have the same measure (2 words)
angle bisector
a ray that divides an angle into two angles that are congruent (2 words)
construction
a geometric drawing that uses a limited set of tools, usually a compass and straightedge
complementary angles
two angles are ____if the sum of their mesures is 90 degrees (2 words)
supplementary angles
two angles are _____if the sum of their measures is 180 degrees (two words)
adjacent angles
two angles that share a common vertex and side but have no common interior points
linear pair
two adjacent angles are ______if their noncommon sides are opposite rays (2 words)
vertical angles
two angles are _____if their sides form two pairs of opposite rays (2 words)
polygon
a closed plane figure that is formed by three or more line segments that intersects exactly two sides, one at each enpoint, so that no two sides with a common endpoint are collinear
vertex of a polygon
each endpoint of the side of a polygon is a _____ (4 words)
convex
a polygon is _____if no line that contains a side of the polygon contains a point in the interior of the polygon
concave
a polygon that is not convex
n-gon
can be used to name a polygon, n represents the number of sides of the polygon (use a hyphen)
equilateral
a polygon that has all sides congruent
equiangular
a polygon that has all angles congruent
regular
a polygon that is a convex polygon and is both equilateral and equiangular
triangle
a three sided polygon
quadrilateral
a four sided polygon
pentagon
a five sided polygon
hexagon
a six sided polygon
heptagon
a seven sided polygon
octagon
an eight sided polygon
nonagon
a nine sided polygon
decagon
a ten sided polygon
dodecagon
a twelve sided polygon
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