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12 terms

Lines, Line Segments, Rays & Angles

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Point
An exact location in space
Line
A straight path of points that goes on and on in two directions
Line Segment
A part of a line-it has two endpoints
Ray
A part of a line-it has one endpoint and continues on and on in only one direction
Angle
Formed by two rays that have the same endpoint
Vertex
The point where two rays meet OR where the sides of a polygon meet OR the point where three or more edges of a solid figure meet
Right Angle
An angle that forms a square corner at 90 degrees
Acute Angle
An angle that is less than a right angle (less than 90 degrees)
Obtuse Angle
An angle that is greater than a right angle (greater than 90 degrees)
Parallel Lines
In a plane, lines that never intersect
Intersecting Lines
lines that pass through the same point
Perpendicular Lines
Two lines that intersect to form right angles

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