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Chapter 17

Lines, Rays, and Angles

vocabularydefinitions
Point An exact location on a line, a plane or in space
Line a straight path that continues without end in both directions
Line Segment a part of a line that has two endpoints and all the points between them
Ray Part of a line that has one endpoint and continues without end in one direction
Plane A flat surface of points that continues without end in all directions
Angle Two rays with the same endpoint
Vertex The point at which two rays meet to form an angle
Protractor A tool for measuring the size of an angle
Degrees (°) The unit used for measuring the size of an angle
Right Angle An angle that measures 90°
Acute Angle An angle that measures greater than 0° and less than 90°
Obtuse Angle An angle that measures more than 90° and less than 180°
Straight Angle An angle that measures 180°
Intersecting Lines Lines that cross each other to form 4 angles
Parallel Line Lines in a plane that never intersect and are always equal distance apart
Perpendicular Lines Lines that intersect to form 4 right angles
Created by: Central 4th Math
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