| A | B |
|---|
| point | Has no size, only location |
| plane | A flat surface that extends indefinitely in four directions |
| segment | A part of a line. Made up of two endpoints |
| ray | Part of a line. Has one end point. |
| line | Continues without end in opposite directions. |
| collinear | A line can be drawn throught a set of points. |
| noncollinear | No line can be drawn through all points. |
| parallel lines | Lines in the same plane that do not intersect. |
| vertical lines | Lines that go up and down. |
| horizontal lines | Lines that go from left to right. |
| skew lines | Lines that are not parallel nor intersecting. |
| angle | Made up of two rays with a common endpoint. |
| acute angle | Measures less than 90 degrees. |
| right angle | Measures 90 degrees. |
| obtuse angle | Measures greater than 90 and less than 180 degrees. |
| straight angle | Measures 180 degrees. |
| complementary angles | Two angles whose sum measures 90 degrees. |
| supplementary angles | Two angles whose sum measures 180 degrees. |
| acutes triangle | A triangle with 3 acute angles. |
| obtuse triangle | A triangle with one angle greater than 90 degrees. |
| right triangle | A triangle with one 90 degree angle. |
| equilateral triangle | A trianlge with three congruent sides. |
| isosceles triangle | A triangle with at least two congruent sides. |
| scalene triangle | A triangle with no congruent sides. |
| polygon | A closed shape formed by line segments that do not cross. |
| convex | A rubber band could fit around snuggly, without any gaps and without crossing itself. |
| quadrilateral | Four sided figure. |
| pentagon | Five sided figure. |
| octagon | Eight sided figure. |
