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line segment
part of a line with two endpoints
postulates
basic rule of geometry.
distance
the length between two objects
ordered pair
(x,y)
line
a grouping of points that create a straight, never ending figure.
space
a collection of planes to create a full three-dimensions
ruler postulate
the distance between two points will be the absolute value of the difference between numbers shown on a ruler
planes
a grouping of lines that are pulled together to create a flat never ending space.
coplanar
two objects with in the same plane. These objects can be lines or any other two dimensional. objects
collinear
two points that lie on the same point
segment addition postulate
if A,B and C are collinear and B is between A than AB+BC=AC
ray
part of a line with one endpoint and extends forever in the other direction. When naming a ray always start with end point
measure
to determine how far apart two geometric objects are
noncollinear
two points that are not on the same line
point
an exact location in space. They will always be labeled with a capital letter
intersection
a point or set of points where lines planes, segments, or rays cross each other
theorem
a statement that can be proven true using postulates definitions and other theorems that have already been proven
angle
when two rays have the same endpoint
vertex
the common endpoint of two rays that form an angle
sides
the two rays that form an angle
degrees
a unit of measurement for angles
opposite rays
two rays that move in exactly opposite direction come together to form a line
straight angle
when measures 180 the angle measures a straight line
right angle
when an angle measure 90
acute angle
angles that measures between 0 and 90
obtuse angle
an angle between 90 and 180 degrees
perpendicular
when two lines intersect to form four right angles
angle addition postulate
if B is on the same interior of angle ADC then m<ADC=m<ADB+<BDC
angle bisector
a segment or plane that divided an angle into two congruent parts and goes through the vertex
congruent
when two geometric figures have the same shape and size
midpoint
a point on a line segment that divides it into two congruent objects
midpoint Postulate
any line segment will have exactly one midpoint
segment bisector
a line, segment, or ray that passes through a midpoint of another segment
Perpendicular bisector
a line, ray or segment that passed through the midpoint of another segment and intersects the segment at a right angle
proof
a logical argument in which each statement you make is backed by a statement that is already accepted as true
complementary angles
when two angles add up to 90
Supplementary angles
two angles added up to 180
adjacent angles
two angles that have the same vertex, share a side and don’t overlap
linear pair
two angles that are adjacent and whose non-common sides form a straight line (supplementary angles)
vertical angles
two non-adjacent angles formed by intersecting lines
vertical angles theorem
if two angles are vertical angles then they are congruent
Note 
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