| A | B |
|---|
| right angle | An angle which has a measurement of 90 degrees |
| acute angle | An angle which has a measurement of less than 90 degrees |
| obtuse angle | an angle which has a measurement of greater than 90 degrees |
| triangle | a polygon with three sides |
| quadrilateral | a polygon with four sides |
| pentagon | a polygon with five sides |
| octagon | a polygon with eight sides |
| symmetry | when two sides of a figure can be matched with each other |
| parallel lines | two lines that remain an equal distance from each other and never intersect |
| perpendicular lines | lines which intersect and form 90 degree angles |
| intersecting lines | lines that cross each other at one point |
| regular polygon | polygons in which the sides are all congruent |
| congruent | of equal size and shape |
| similar | equal in shape but not in size |
| angle | two rays that meet at a common vertex |
