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Lines 1 Lines 2 Angles
100
What is a point?
An exact location in space.
100
What is a plane?
A flat surface that extends forever in all directions.
100
What is a vertex?
The point where two sides come together.
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.
200
What is an acute angle?
An angle that is less than 90 degrees.
300
What is a line segment?
Part of a line with two endpoints.
300
What are perpendicular lines?
Intersecting lines that form right angles.
300
What is a right angle?
An angle that is 90 degrees.
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.
400
What is an obtuse angle?
Angle measuring more than 90 degrees.
500
What is a ray?
Part of a line with one endpoint, extending forever in only one direction.
500
What are skew lines?
Lines that lie in different planes. They do not intersect and are not parallel.
500
What is a straight angle.
An angle measuring 180 degrees.






Geometric Ideas

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