| A | B |
|---|
| vertex | point where two line segments meet to form an angle |
| side | any one of the line segments that form a polygon |
| angle | amount of turning |
| base | the side or face on which an object lies on |
| height | the perpendicular distance from the base to the opposite vertex |
| perpendicular | two straight lines that are perpendicular to each other intersect each other at right angles |
| area | amount of surface covered |
| right triangle | a triangle with exactly one right angle |
| acute triangle | a triangle with all angles measuring less than 90 |
| obtuse triangle | a triangle with one angle measuring greater than 90 |
