20 terms

# Prentice Hall Course 2 Chapter 7 Sec 1 and 2

Geometry
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line
a series of points that extend in opposite directions without end.
ray
a part of a line with one endpoint and all points of the line on one side of the endpoint.
segment
a part of a line with two endpoints and all points in between.
plane
a flat surface that extends indefinitely in all directions and has no thickness.
intersecting lines
lie in the same plane and have exactly one point in common.
parallel lines
lines in the same plane that never intersect.
skew lines
lie in different planes and are neither parallel nor intersecting.
angle
is a figure formed by two rays with a common endpoint.
vertex
the point of intersection of two sides of an angle or figure.
point
a location in space that has no size
acute angle
an angle less than 90 degrees but more than 0 degrees
obtuse angle
an angle between 90 and 180 degrees
right angle
an angle that measures 90 degrees
straight angle
an angle of 180 degrees
complementary angles
Two angles whose sum is 90 degrees
supplementary angles
Two angles whose sum is 180 degrees