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Geometry Terms
Lott - Geometry Terms - iReady
| term | definition |
|---|---|
| ray | a straight row of points that start at one point and go on forever in one direction |
| line | a straight row of points that go on forever in both directions |
| line segment | a row of points that start at one specific point and ends at another |
| angle | a pair of rays, lines. or line segments that meet at one common point, or vertex |
| vertex | a point where two lines, rays, or line segments meet to create an angle |
| parallel lines | lines that are the same distance between one another and that never cross |
| perpendicular lines | lines, rays, or line segments that cross one another |
| point | a specific location in space |
| acute angle | an angle that measures less than 90 degrees but more than 1 degree |
| obtuse angle | an angle that measure more than 90 degrees and less than 180degrees |
| right angle | an angle that measures exactly 90 degrees |
| straight angle | an angle that measures exactly 180 degrees |
| unit angle | an angle that measures 1 degree |
| reflex angle | an angle that is greater than 180 degrees but less than 360 degrees |
| intersecting lines | lines that cross and make a "v" or make an angle that is less than 90 degrees or more than 90 degrees |
| protractor | a tool used to measure an angle |
| benchmark angle | angles such as 45° (half of a right angle), 90° (right) and 180° (straight), that can be used as a reference to estimate an angle's size |
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