|
 zero angle | An angle that measurse 0 degrees |
| straight angle | An angle that measures 180 degrees |
| acute angle | an angle that measures from 0 to 90 degrees |
| right angle | an angle that measures 90 degrees |
| obtuse angle | an angle that measures from 90 degrees to 180 degrees |
| scalene triangle | a triangle that no sides are the same in length |
| isosceles triangle | a triangle that has 2 sides the same length |
| equilateral triangle | a triangle that has all the sides the same length |
| perpendicular lines | lines that cross to form a right angle. |
| parallel lines | lines that are the same distance apart and never meet. |
| ray | a line that starts at one point and goes forever in one direction |
| line segment | part of a line that has two endpoints. |
| line | a straight segment that goes forever in both directions. |
| point | a dot in space labeled by a Capital letter |
| angle | two rays that are connected by a common endpoint |
| vertex | the endpoint that is at the point where 2 rays meet to form the angle. |
| collinear | points that are on the same line |