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18 Cards in this Set
- Front
- Back
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What is a line?
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A line is a set of continuous points that extend indefinitely in either direction.
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What is a plane?
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A plane is a flat surface that extends infinitely in all directions.
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What are parallel lines?
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Parallel lines are two lines in the same plane that do not intersect.
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What is a polygon?
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A polygon is a closed figure with three or more sides that intersect only at their endpoints.
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What are postulates?
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Postulates are generalizations in geometry that cannot be proven true. They are just accepted as true.
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What is a point?
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A point is a specific place in space. A point has no dimension. It has no length, width or depth.
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What is a line segment?
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A line segment is a part of a line with two endpoints.
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What is a ray?
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A ray has one endpoint and extends infinitely in the other direction.
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What are opposite rays?
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Opposite rays are two rays that have the same endpoint and form a straight line.
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What are collinear points?
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Collinear points lie on the same line.
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What are noncollinear points?
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Noncollinear points do not lie on the same line.
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What is an angle?
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An angle is a pair of two rays that have the same endpoint.
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What are theorems?
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Theorems are generalizations in geometry that can be proven true.
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What is an acute angle?
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An acute angle measures less than 90 degrees.
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What is a right angle?
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A right angle measures exactly 90 degrees.
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What is an obtuse angle?
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An obtuse angle measures more than 90 degrees.
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What is a straight angle?
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A straight angle measures exactly 180 degrees.
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What is a reflex angle?
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A reflex angle has a measure greater than 180 degrees and less than 360 degrees.
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