| A | B |
|---|
| line | a straight path goes forever both directions |
| ray | part of a line; only one end point |
| angle | two rays, same end point |
| endpoint | point at end of a ray |
| vertex | point that two rays of angle share |
| parallel | two lines never cross,equal distance from each other |
| intersecting | two lines that cross each other |
| perpendicular | two lines that form square corners where they intersect |
| plane | endless flat surface named by 3 points not on same line |
| acute angle | less than 90 degrees |
| obtuse angle | more than 90 degrees |
| straight angle | angle equal to 180 degrees |
| right angle | angle equal to 90 degrees |
| degrees | unit of measurement of angles |
| quadrilateral | a polygon with 4 sides |
| polygon | closed plane figure;3 or more line segments |
