| A | B |
|---|
| sides | the line segmant or surface that encloses something |
| vertex | a point where two sides of a polygon intersect |
| degree | the unit of measure for an angle |
| protractor | an instrument used to measure angles |
| acute angle | an angle that measures less than 90 degrees |
| obtuse angle | an angle that measures more than 90 degrees |
| right angle | an angle that measures 90 degrees |
| straightedge | a ruler or any object with a straight side that can be used to draw a line |
| line segment | a series of points with a beginning and an end |
| ray | a series of points with a beginning that continues in the opposite direction |
| polygon | a many sided closed figure |
| vertices | the plural of vertex |
| triangle | a 3-sided figure |
| quadrilateral | a 4-sided figure |
| parallel | two lines that never meet or cross each other |
| parallelogram | a quadrilateral that has both pairs of opposite sides equal and parallel |
| pentagon | a 5-sided figure |
| hexagon | a 6-sided figure |
| octagon | an 8-sided figure |
| equilateral triangle | a triangle with 3 equal sides |
| symmetry | any line that divides a shape or object into matching halves |
| congruent | figures having the same size and shape |
| similar | figures having the same shape but different size |
