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17 terms

Math sec. 8.1-8.2

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Lines
made up of a series of points that extend in two opposite directions
point
exact location in space
segment
the part of a line consisting of two endpoints and all points between them
ray
A part of a line, with one endpoint, that continues without end in one direction
collinear
points that lie on the same line
plane
A flat surface that goes on forever in all directions
intersecting lines
lines that have exactly one point in common
Parallel lines
Lines that have no points in common
skew lines
lines that are not parallel and do not intersect
angle
two rays with a common endpoint, called the vertex
vertex
The common endpoint of an angle
acute angle
less than 90 degrees
right angle
an angle that measures 90 degrees
obtuse angle
measures between 90 and 180 degrees
straight angle
an angle whose measure is 180 degrees
perpendicular lines
Two lines that intersect to form right angles
degrees
a unit for measuring angles