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Lines and Angles
JoAnne Hodgson’s
Geometry Unit
Ray
Ray--part of a line that has one
endpoint and goes on endlessly
in the other direction.
Congruent
Equal in size and shape.
Degrees
70
The unit used to
measure angles.
Line Segment
A part of a line that has
two endpoints.
Line
A series of points that go
endlessly in both directions.
Vertex
The point at which two rays
join together to form an
angle.
Obtuse Angle
An angle that measures more
than 90 degrees.
Acute Angle
An angle that measures
less than 90 degrees.
Right Angle
An angle that measures
90 degrees.
Straight Angle
An angle that measures
180 degrees. (a.k.a. straight
line)
Parallel Lines
Two lines that are equal
distance apart and will
never intersect.
Perpendicular Lines
Two lines that intersect to
form two right angles.