Terms of Geometry defined
Terms
undefined, object
copy deck
- 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 are parallel lines?
- Parallel lines are two lines in the same plane that do not intersect.
- What is a polygon?
- A polygon is a closed figure 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 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 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 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 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.