| A | B |
|---|
| ( n - 2 ) 180 | In a polygon with n sides, the sum of the angle measures |
| 180 degrees | the sum of the angle measures of a triangle= (3-2) 180 |
| 360 degrees | the sum of the angle measures of a quadrilateral= (4-2) 180 |
| 540 degrees | the sum of the angle measures of a pentagon= (5-2) 180 |
| 720 degrees | the sum of the angle measures of a hexagon = (6-2) 180 |
| 900 degrees | the sum of the angle measures of a heptagon = (7-2) 180 |
| 1080 degrees | the sum of the angle measures of an octagon = (8-2) 180 |
| The sum of the measures of the exterion angles of any polygon | 360 degrees |
| exterior angle | The angle is adjacent to an interior angle of the polygon and formed when one side of the polygon is extended. |
| adjacent angle | two coplanar angles that share a vertex and a side but do not overlap |
