Point
a point has no demention. It is usually represents by a dot usues a capital block leter
Line
A line has one demension it is usually represented by a straight line with two arrow reads that extends withous end
Plane
Has two demensions it is usually represented by a shapw that looks like a floor or a wall. You must imagine that it extens with out end, even though with edges
Collinear points
points that lie on the same line
Coplanar points
Points that lie on the same plane
Line Segment
part of a line consist of two points called end points
ray
part of a line taht consists of a point on the line that extend in one dimention
Opposite rays
if point c lies on between A and B, then CA and CB are opposite rays
Intersection
the set of points that figures have in common if two line intersect, always a single point, if two planes intersect, always a line
Postulate
a rule that is accepted without proof
theorem
a true statement that follows a result of other true statements can be proven
coordinate
the real number that corresponds to a point of a line
Distance
the absolute value of the difference of the coordinates of the points the DIstance between points A and B written as AB, is also called the length of AB
Between
When three points lie on a line, you can say that one point is between the other two
Congruent segments
line segments taht have the same length
Segment Addistion Postulate
Can be used whoever there are three colinear points.
midpoint
a point that divides, or bisects, a segment into two congruent segments
Segment Bisector
A point, ray, line, segment, or plane that intersects a segment at its midpoint
Angle
consists of two different rays with the same end points
sides of an angle
the rays that form the angle
vertex of an angle
the common end point
measure of an angle
the muesutre of an angle is a measure of the separation of the two sides of the angle. THe unites for the measure of an angle are degres
Acute angle
An angle with a measure between 0 and 90
Right angle
angle with a measure equal to 90
Obtuse angles
an angle with the measure between 90 and 180
Straight angle
an angle with a measure of 180
Congruent angles
angles that have the same measure
Angle bisector
a ray flat divides an angles that are congruent
Adjacent angles
two angles taht share a common vertex and side, but share no common interior points
Complementary angles
two angles whose measures have the sum of 90 the sum of the measure of an angle and its complement is 90 Do not have to be adjacent
Supplementary angles
two angles whose measures have the sum of 180 the sum of the measures of an angle and its supplement is 180
linear pair
two adjecent angles whose non common sides are the opposite rays, a linear pair is always 3/4 supplementary, but supplementary adjaycent and angles are not always a linear pair
vertical angels
two angles whose sides form two pairs of opposite rays vertical angles are formed by intercecting lines
polygon
a closed figure with these properties, it is formed by three or more lines segments called sides each side intersects exactly two sides one and each end point, so that no two sides with a comon end point are collinear
sides
each line semgent had forms of polygons
vertex
each end point of a side of a polygon plural is verticles
concave
a olygon that is not convex
N-Gon
a polygon with n sides
Equilateral
a polygon with all its sides are congruent
equiangular
a polygon with all of it's interial angles congruent
regular
a polygon taht has all sides and all angles congruent