| A | B |
|---|
| arc | piece of great circle |
| Great Circle | used instead of line on the sphere |
| sphere | used instead of plane |
| equator | great circle dividing globe in half |
| pole points | opposite points on the sphere |
| perpendicular | making right angles |
| parallel | lines that never intersect |
| segment | piece of a line |
| finite | able to be measured |
| infinite | not able to be measured or counted |
| right angle measure | 90 degrees |
| great circle measure | 360 degrees |
| largest arc measure | 180 degrees |
| simplest object in both geometries | point |
| degrees | unit used to measure arcs |
