| A | B |
|---|
| acute angle | an angle that is greater than zero but less than 90 degrees. |
| adjacent angle | two angles next to each other with a common vertex |
| angle | a figure formed by two rays that have the same endpoint |
| angle bisector | a ray that divides an angle into two congruent angles |
| bisector of a line segment | a line, segment, ray, plane or point that intersects the segment at its midpoint |
| collinear points | points on the same line |
| complementary angles | two angles whose sum measures 90 degrees |
| coplanar points | points in the same plane |
| equiangluar triangle | a triangle with all angles equal |
| equilateral triangle | a triangle with all sides equal |
| geometry | the study of those figures which lie in a plane or flat surface. |
| intersection | the set of points in both figures (two lines |
| isosceles triangle | a triangle with at least 2 sides equal |
| line | a straight arrangement of points that extends indefinitely in both directions |
| linear pair | an adjacent pair of angles whose noncommon sides are a pair of opposite rays. |
| midpoint of a segment | a point that divides a segment into two congruent segments |
| noncoplanar points | points not in the same plane |
| nonlinear points | points not on the same line |
| obtuse angle | an angle that is greater than 90 degrees but less than 180 degrees |
| obtuse triangle | a triangle with one obtuse angle |
| opposite rays | two rays with a common endpoint that form a line |
| parallel lines | Two or more lines in the same plane that do not intersect |
| perpendicular lines | two lines that form right angles |
| plane | a flat surface that has no thickness that extends in all directions |
| point | has no size, represented by a dot, names location, named by a capitol letter |
| ray | a portion of a line that goes indefinitely in one direction from an endpoint |
| reflex angle | an angle greater than 180 degrees but less than 360 degrees |
| right angle | an angle that equals 90 degrees |
| right triangle | a triangle with one right angle |
| scalene triangle | a triangle with no sides equal |
| segment | 2 points on a line and all the points between them |
| space | set of all points |
| straight angle | an angle equal to 180 degrees |
| supplementary angles | two angles whose sum measures 180 degrees |
| vertex | the vertex of an angle is the common endpoint of the rays that make the angle |
| vertical angles | Nonadjacent angles formed at the intersection of two lines. |
| congruent segments | segments that have the same length |
| 3 undefined terms | point, line and plane |
| congruent angles | two angles with equal measures |
| bisector of an angle | the ray that divides an angle into two congruent adjacent angles |
| skew lines | 2 lines that do not intersect and are not coplanar |
| parallel planes | 2 or more planes that do not intersect |
