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18 Cards in this Set

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  • Back
a location that has no size; named by a capital letter
point
defined as the set of all points
space
a series of points that extends in two opposite directions without end; named by any two points or with a single lowercase letter
line
on the same line
collinear
a flat surface that has no thickness; named by either a single capital letter or by at least three of its noncollinear points
plane
points and lines in the same plane
coplanar
an accepted statement of fact
postulate (axiom)
through any two points there is:
exactly one line
if two lines intersect, then they intersect in:
exactly one point
if two planes intersect, then they intersect in:
exactly one line
through any three noncollinear points ther is:
exactly one plane
the part of a line consisting of two endpoints and all points between them; named by endpoints
segment
the part of a line consisting of one endpoint and all the points of the line on one side of the endpoint; named by the endpoint and another point
ray
lines that do not intersect
parallel lines
lines that do not intersect but are noncoplanar
skew lines
measure of angle is greater than 0 but less than 90
acute angle
measure of angle equals 90
right angle
measure of angle is greater than 90 but less than 180
obtuse