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Geometry Chapter 1
basic Geometry vocabulary
30
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10th Grade
09/28/2011

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Term
point
Definition
a location
Term
line
Definition
made up of points; has no thickness or width
Term
colinear
Definition
points on the same line
Term
plane
Definition
a flat surface made up of points
Term
coplanar
Definition
points that lie on the same plane
Term
space
Definition
a boundless, three-dimensional set of all points
Term
line segment
Definition
a segment with two end points
Term
precision
Definition
the precise measurement
Term
congruent
Definition
segments with the same measure
Term
midpoint
Definition
the point halfway between the endpoints of the segment
Term

segment bisector

Definition
any segment, line or plane that intersects a segment at its midpoint
Term
ray
Definition
a part of a line that extends indefinitely in one direction
Term
opposite rays
Definition
two rays such as BA and BC suggest that B is between A and C
Term
vertex
Definition
the common endpoint
Term
constructions
Definition
method of drawing geometric figures without the benefit of measuring tools
Term
acute
Definition
angle that equals less than 90 degrees
Term
obtuse
Definition
angle that equals more than 90 degrees
Term
right angle
Definition
angle that equals 90 degrees
Term
angle bisector
Definition
a ray that divides an angle into two congruent angles
Term
adjacent angle
Definition
two angles that lie in the same plane, have a common vertex, but no common interior points
Term
vertical angles
Definition
two non adjacent angles formed by two intersecting lines
Term
linear pair
Definition
a pair of adjacent angles, whose common sides are opposite rays
Term
complementary angle
Definition
two angles whose measures have a sum of 90 degrees
Term
supplementary angle
Definition
two angles whose measures have a sum of 180 degrees
Term
perpendicular
Definition
lines that form right angles
Term
convex
Definition
no points of the line are in the interior
Term
concave
Definition
some of the lines pass through the interior
Term
n-gon
Definition
a polygon with n/more than twelve sides
Term
regular polygon
Definition
convex polygon in which all the sides/angles are congruent
Term
perimeter
Definition
the sum of the lengths of a shapes sides
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