Shared Flashcard Set

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Lines and Angles
vocabulary terms
11
Mathematics
4th Grade
02/15/2010

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Cards

Term
It has no endpoint. There are arrows on each end.
Definition
Line
Term
It has 2 endpoints. Its length can be measured.
Definition
Line Segment
Term
It is part of a line. One end has an endpoint. The other end goes on forever.
Definition
Ray
Term
Two lines that meet or cross at a right angle. (Remember: a right angle looks like the side of a square!)
Definition
Perpendicular lines
Term
Lines that never cross or intersect each other. (Think railroad tracks!)
Definition
Parallel lines
Term
Lines that meet or cross (Not at 90 degrees)
Definition
Intersecting lines
Term
Two rays, when sharing the same endpoint, form one of these.
Definition
Angle
Term
Two rays that share the same endpoint form an angle. What is this endpoint called?
Definition
Vertex
Term
An angle that is less than a Right Angle. (less than 90 degrees) It is so Cute!
Definition
Acute Angle
Term
An angle that equals 90 degrees.It looks like the side of a square--look for the special little symbol like a box in the angle.
Definition
Right Angle
Term
An angle that is greater than 90 degrees. (It is greater than a Right Angle!)
Definition
Obtuse Angle
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