| A | B |
|---|
| straight angle | an angle that measures 180 degrees |
| vertical/opposite angle | angles that are across from each other, they do not share a common side |
| scalene triangles | a triangle with all three sides having different lengths |
| reflex angle | an angle measuring greater than 180 degrees and less than 360 degrees |
| equilateral triangle | a triangle with all three sides of equal length |
| regular polygon | a polygon whose sides are all the same length and whose angles are all equal |
| parallel | lines that will never cross or meet |
| obtuse angle | angle measuring more than 90 degrees and less than 180 degrees |
| quadrangle | a polygon that has four angles |
| acute angle | an angle that measures greater than 0 degrees and less than 90 degrees |
| congruent | having the same size and shape |
| tessellation | an arrangement of shapes that cover a surface completely without overlaps or gaps |
| adjacent angle | angles that are next to each other |
| right triangle | a triangle that has a right angle. 90 degrees |
| right angle | an angle that measures 90 degrees |
| polygon | a two dimensional figure that is made up of three or more line segments joined end to end to make a closed path |
| isosceles triangle | a triangle with at least two sides equal in length |
