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### 18 Cards in this Set

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 What is a point ? A point is a specific place in space. A point has no dimension. It has no length, width or depth. What is a line ? A line is a set of continuous points that extend indefinitely in either direction. What is a plane ? A plane is a flat surface that extends infinitely in all directions. What is a line segment ? A line segment is a part of a line with two endpoints. What is a ray ? A ray has one endpoint and extends infinitely in the other direction. What are opposite rays ? Opposite rays are two rays that have the same endpoint and form a straight line. What are parallel lines ? Parallel lines are two lines in the same plane that do nor intersect. What are collinear points ? Collinear points lie on the same line. What are noncollinear points ? Noncollinear points do not lie on the same line. What is an angle ? An angle is a pair of two rays that have the same endpoint. What is a polygon ? A polygon is a closed figue with three or more sides that intersect only at their endpoints. What are Postulates ? Postulates are generalizations in geometry that cannot be proven true. They are just accepted as true. What are Theorems ? Theorems are generalizations in geometry that can be proven true. What is an acute angle ? An acute angle measures less than 90 degrees. What is a right angle ? A right angle measures exactly 90 degrees. What is an obtuse angle ? An obtuse angle measures more than 90 degrees. What is a straight angle ? A straight angle measures exactly 180 degrees. What is a reflex angle ? A reflex angle has a measure greater than 180 degrees and less than 360 degrees.