|
 point | an exact spot in space |
| line | a straight path that goes on and on in 2 directions |
| parallel lines | lines that will never cross |
| intersecting lines | lines that cross through the same point |
| perpendicular lines | lines that cross and from square corners (right angles) |
| line segment | part of a line with 2 endpoints |
| ray | part of a line that has 1 endpoint and goes on forever in one direction |
| angle | figure formed by 2 rays with the same endpoint |
| right angle | a square corner (90 degrees) |
| acute angle | an angle less than a right angle |
| obtuse angle | an angle greater than a right angle |
| vertex | the endpoint shared by the 2 rays of an angle |
| degrees | the unit used to measure angles |
| protractor | tool used to measure and draw angles |
| polygon | a closed figure with straight sides |
| vertex | the place where 2 sides of a polygon meet |
| triangle | a polygon with 3 sides |
| quadrilateral | a polygon with 4 sides |
| pentagon | a polygon with 5 sides |
| hexagon | a polygon with 6 sides |
| octagon | a polygon with 8 sides |
| equilateral triangle | a triangle with 3 equal sides |
| isosceles triangle | a triangle with 2 equal sides |
| scalene triangle | a triangle with no equal sides |
| right triangle | a triangle with one right angle |
| acute triangle | a triangle with 3 acute angles |
| obtuse triangle | a triangle with one obtuse angle |
| trapezoid | a quadrilateral with 1 pair of parallel sides |
| parallelogram | a quadrilateral with 2 pairs of parallel sides |
| rectangle | a parallelogram with 4 right angles |
| rhombus | a parallelogram with 4 equal sides |
| square | a parallelogram with 4 right angles and 4 equal sides |
| Hughbert-agone | a one-sided polygon |
| Hughangle | a special triangle that has one side |
| pepergon | a ducoloy that goes quack |
