Geometry 1 2
Terms
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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.