| A | B |
|---|
| supplementary angles | add up to 180 degrees |
| complementary angles | add up to 90 degrees |
| obtuse angle | angle greater than 90 degrees and less than 280 |
| acute angle | angle less than 90 degrees |
| right angle | 90 degree angle |
| congruent | same size and shape |
| similar | same shape and proportional |
| line segment | a portion of a line that has beginning and ending point |
| ray | a portion of a line that starts at a point and keeps going in other direction |
| line | a continuous set of points going in both directions |
| point | an exact location in space |
| scalene triangle | no sides are equal |
| equilateral triangle | all sides are equal |
| isosceles triangle | two sides are equal |
| angle | two rays from one point |
| circle | a set of continuous points equally distant from the center |
| circumference | the distance around the outside of a circle |
| radius | a line segment from the center to the circumference of a circle |
| diameter | a line segemnt passing through the center with endpoints on the circumference |
| plane | has 2 dimensions- length and width |
| solid figure | has 3 dimensions- length, width, and height |
| straight angle | exactly 180 degrees |
| intersecting lines | meet at a point |
| parallel lines | never intersect |
| perpendicular lines | intersect at right angles |
| diagonal lines | lines running at a slant |
| vertical lines | lines running up & down |
| horizontal lines | lines running across |
