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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.
