| A | B |
|---|
| Two points determine | a line |
| collinear points | 3 or more points the lie on the same line |
| noncollinear points | points not on the same line |
| segment | portion of a line between any two points on the line |
| plane | 3 collinear points in space determine a flat surface |
| parallel lines | 2 lines that do not intersect |
| parallel planes | 2 planes that do not intersect |
| skew lines | 2 nonparallel lines that do not intersect |
| meter | in metric system, basic unit of length |
| centimeter | 1/100 of a meter |
| millimeter | 1/1000 of a meter |
| kilometer | 1000 meters |
| congruent segments | segments equal in length |
| midpoint | point that divides a segment into 2 equal segments |
| congruent angles | angles equal in measure |
| angle | figure formed by 2 rays with the same endpoint |
| degrees | units of angle measure |
| protractor | tool used to measure angles |
| perendicular | when 2 lines intersect and form right angles |
| right angle | angle measuring 90 degrees |
| acute angle | angle measuring less than 90 degrees |
| obtuse angle | angle measuring over 90 degrees |
| complementary angles | 2 angles whose sum of the measures is 90 degrees |
| supplementary angles | 2 angles whose sum of the angles measures 180 degrees |
| vertex (vertices) | common endpoint (s) where 2 rays meet |
| ray | A straight line extending from an endpoint |
| congruent figure | same size and shape |
| intersecting planes | planes that intersect in a line |
