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g e o m e t r y.
vocabulary
| Question | Answer |
|---|---|
| space | space is a boundless 3-dim ensional set of all points. |
| intersecting planes | intersecting planes share an infinite number of points. |
| plane | a plane is a flat surface that has no thickness. |
| postulate | a statement accepted to be true without proof. |
| line segment | a line segment is a portion of a line betweentwo points called endpoints. |
| point | a point has no length, no width, or thicknes, but has a position. |
| opposite rays | opposite rays start at the same point. |
| ray | a ray is a part of a line that consist of an initial point. |
| parallel lines | parallel lines are coplanar lines that do not intersect. |
| coplanar | figure in the same plane |
| angle | formed by two rays with the same endpoint. |
| coordinate | a point by any order. |
| perpendicular lines | lines that intersect and form right angles. |
| right angle | measures exactly 90 degrees. |
| obtuse angle | measures more than 90 degrees. |
| skew lines | noncoplanar lines. |
| midpoint | a point that divides a segment into two congruent segments. |
| acute angle | measures less then 90 degrees. |
| parallel planes | do not intersect. |
| protactor | measuring device for angles. |