Title: Lines and Angles
1Lines and Angles
- JoAnne Hodgsons
- Geometry Unit
2Ray
Ray--part of a line that has one endpoint and
goes on endlessly in the other direction.
3Congruent
Equal in size and shape.
4Degrees
70
The unit used to measure angles.
5Line Segment
A part of a line that has two endpoints.
6Line
A series of points that go endlessly in both
directions.
7Vertex
The point at which two rays join together to form
an angle.
8Obtuse Angle
An angle that measures more than 90 degrees.
9Acute Angle
An angle that measures less than 90 degrees.
10Right Angle
An angle that measures 90 degrees.
11Straight Angle
An angle that measures 180 degrees. (a.k.a.
straight line)
12Parallel Lines
Two lines that are equal distance apart and
will never intersect.
13Perpendicular Lines
Two lines that intersect to form two right angles.