| A | B |
|---|
| line | set of points that continues w/out end in opposite diections |
| angle | the figure formed by two rays with a common endpoint |
| vertex | common endpoint of rays forming an angle |
| line segment | part of line that has 2 endpoints |
| degree | common unit of measure for angles |
| acute angle | angle measures less than 90* |
| obtuse angle | angle measures between 90* and 180* |
| straight angle | angle measures exactly 180* |
| right angle | angle measures exactly 90* |
| complimentary | sum of 2 angles = 90* |
| supplementary | sum of 2 angles = 180* |
| polygon | simple closed figure formed by 3 or more line segments |
| simple polygon | line segments don't cross |
| closed polygon | when drawn, your pencil ends up where it started |
| congruent | the line segments and angles have the same measure |
| acute triangle | all angles less than 90* |
| obtuse triangle | one angle is greater than 90*, two are less than 90* |
| right triangle | one angle is 90* |
| scalene | no congruent sides |
| isosceles | at least 2 congruent sides |
| equilateral | 3 congruent sides |
| triangle | 3 sides |
| quadrilateral | 4 sides |
| perimeter | distance around a geometeric figure |
| circle | set of points in a plane that are the same distance from a given point |
| center | given point from which all points on a circle are the same distance |
| circumference | distance around a circle |
| diameter | distance across a circle through center |
| radius | distance from center to any point on circle |
| regular polygon | all sides are conguruent and all angles are all congruent |
| reflex angle | angle that is greater than 180* but less that 360* |
