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