Chapter 1 Test Flashcards
point
a location in space
line
set of points extending in both directions forever
plane
a flat surface extending in all directions forever
space
set of all points
collinear
points that are on the same line
coplanar
points and lines on the same plane
equidistant
equal in distance
two lines intersect at a __
point
two planes intersect at a __
line
segment
all the points between two points on a line
ray
part of a line that has one endpoint and goes in one direction forever
opposite rays
two rays with the same endpoint and go in opposite directions
postulate
a statement that is accepted without proof
congruent
two objects that have the same size and shape
midpoint
a point that divides a segment into two congruent segments
segment bisector
a line, ray, segment, or plane that intersects a segment at its midpoint
segment addition postulate
if B is between A and C, then AB + BC = AC
angle
two rays with the same endpoint
adjacent angles
two coplanar angles that have a common vertex, a common side, and no common interior points.
acute angle
an angle with a measure less than 90 degrees
right angle
an angle with a measure equal to 90 degrees
obtuse angle
an angle with a measure between 90 and 180 degrees.
straight angle
an angle with a measure equal to 180 degrees
angle bisector
a ray that divides an angle into two congruent adjacent angles
theorem
statement that is proven
Postulate 5
A line contains at least two points; A plane contains at least three noncollinear points. Space contains at least four points not on a plane.
Postulate 6
Through any two points there is exactly one line.
Postulate 7
Through any three points there is at least one plane, through three non collinear points there is exactly one plane.
Postulate 8
If two points are in a plane, then the lines that contain the points is in that plane.
Postulate 9
If two planes intersect, there intersection is a line.
(Angle) AB + BC = AC
Anglular Addition Postulate
AB + BC = AC
Segment Addition Postulate
