| A | B |
|---|
| point | endpoint |
| ray | point with arrow in one direction |
| line | arrow on both ends in opposite directions |
| parallel lines | pair of lines equidistant apart that never touch |
| perpendicular lines | lines that touch or cross at right angles |
| intersecting lines | lines that cross but do not make right angles |
| line segment | line with an endpoint on each end |
| angle | two lines, line segments, or rays connected |
| right angle | equals exactly 90 degrees |
| acute angle | angle equal to less than 90 degrees |
| obtuse angle | angle equal to greater than 90 degrees but less than 180 |
| straight angle | angle equal to exactly 180 degrees |
| shapes | 2-dimensional figures in geometry |
| solids | 3-dimensional figures in geometry |
| polygons | shapes with straight sides all connected |
| triangles | polygons with 3 sides and 3 angles |
| quadrilaterals | polygons with 4 sides and 4 angles |
