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18 Cards in this Set

  • Front
  • Back
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.