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Lines 1 Lines 2
100
What is a point?
An exact location in space.
100
What is a plane?
A flat surface that extends forever in all directions.
200
What is a line?
A straight path of points that goes on forever in only one direction.
200
What are congruent line segments?
Line segments with the same lengh.
300
What is a line segment?
Part of a line with two endpoints.
300
What are perpendicular lines?
Intersecting lines that form right angles.
400
What is a midpoint?
The point halfway between the endpoints of a line segment.
400
What are parallel lines?
Lines that are in the same plane but do not intersect.
500
What is a ray?
Part of a line with one endpoint, extending forever in only one direction.
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Lines that lie in different planes. They do not intersect and are not parallel.






Geometric Ideas

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