| A | B |
|---|
| geometry | the study of points, lines and planes and how they exist in space |
| plane geometry | the study of planes ( 2 dimensional) |
| solid geometry | the study of solid figures ( 3 dimensional) |
| plane | a flat surface which continues in all directions |
| point | these form paths, which form lines and shapes |
| line segment | part of a line with 2 endpoints |
| line | straight path of points, continues in both directions |
| ray | a part of a line which begins at an endpoint and continues in one direction |
| congruent | line segments, shapes, or angles which are equal in measurement |
| similar | same shape |
| horizontal | a a type of line going from left to right |
| vertical | a type of line going up and down |
| intersecting lines | a pair of lines that cross each other at a point |
| parallel lines | 2 lines in the same plane that will never meet |
| angle | 2 rays withe the same endpoint form this |
| vertex | the middle point of an angle |
| degrees | used to measure angles |
| protractor | instrument used to measure angles |
| right angle | 90 degrees |
| acute angle | less than 90 degrees |
| obtuse angle | more than 90 degrees |
| straight angle | 180 degrees |
| supplementary | 2 angles whose sum is 180 degrees |
| complementary | a pair of angles whose sum is 90 degrees |
