###
collinear points

points on the same line

###
congruent line segment

Line segments that have the same length

###
point

a location in space that has no size

###
line

a set of points that form a stright path extending in oppsite directions without end

###
angle

figure formed by two rays with the same initial point

###
geometry

the pure mathematics of points and lines and curves and surfaces

###
noncolliear points

are points that do not lie on the same line

###
coplanar points

points all in one plane

###
intersection

the act of intersecting (as joining by causing your path to intersect your target's path), a place where two or more points meet

###
midpoint of a segment

The point that divides a segment into two congruent segments.

###
endpoints

points on the ends of line segments

###
plane

two dimensional flat surface, extends forever.

###
space

contains at least 4 points not in one line

###
obtuse angle

an angle between 90 and 180 degrees

###
straight angle

an angle of 180 degrees

###
side

formed by rays

###
opposite rays

two rays with the same initial point that go in opposite directions

###
vertex

the point of intersection of lines or the point opposite the base of a figure

###
bisector of a segment

a line, segment, ray, or plane that intersects the segment at its midpoint

###
acute angle

an angle less than 90 degrees but more than 0 degrees

###
congruent angles

Angles that have the same measure

###
right angle

the 90 degree angle between two perpendicular lines

###
vertical angles

angles are formed opposite of each other when two lines intersect

###
bisector of an angle

the ray that divides the angle into two congruent adjacent angles

###
perpendicular lines

two lines that meet and form a right angle

###
postulates

assumptions

###
noncoplaner points

points that are not in the same plane

###
segment

a part of a line with two endpoints

###
adjacent angles

Two angles with a common side, a common vertex, and no common points within the angles

###
supplementary angles

Two angles that add to 180º are called

###
complementary angles

if the sum of two angles is 90%

###
degree

unit based to measure angles ( symbol )

###
ray

Part of a line that has one endpoint and extends indefinitely in one direction.

###
perpendicular bisector

A line that is perpendicular to a segment at its midpoint.

###
corresponding angles

two angles in corresponding positions relative to two lines cut by a transversal

###
alternate exterior angles

Two nonadjacent exterior angles on opposite of the transversal.

###
same side-interior angles

interior angles on the same side of a transversal

###
exterior lines

The angle on the outside of a transversal.

###
skew lines

noncoplanar lines that do not intersect

###
parallel planes

planes that don't intersect

###
parallel lines

parallel lined

###
transversal

is a line that intersects each of two other coplanar lines in different points

###
interior angles

the angle inside of a transversal

###
alternate interior angles

two nonadjacent interior angles on opposite of the transversal

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