Question | Answer |
Polygon | A closed figure made up of line segments |
Vertex | The point where two or more sides meet |
Interior angle | Angle formed on the inside of a polygon by two sides meeting at a vertex |
Exterior angle | Angle formed on the outside of a geometric shape by extending one of the sides past a vertex |
Supplementary angles | Angles that add up to 180 degrees |
Complementary angles | Angles that add up to 90 degrees |
Polygon exterior angle sum theorem | The sum of the exterior angles in a triangle is 180 degrees |
Exterior angle theorem | The exterior angle at each vertex of a triangle is equal to the sum of the interior angles at the other two verticies |
Angle sum triangle theorem | The sum of the interior angles of a triangle are 180 degrees |
Adjacent | Adjoining or next to |
Transversal | A line intersecting two parallel lines |
Obtuse angle | Angle greater than 90 degrees |
Acute angle | Angle less than 90 degrees |
Convex polygon | A polygon where all interior angles are less than 180 degrees |
Concave polygon | A polygon where there is atleast one interior angle greater than 180 degrees |
Regular polygon | A polygon with all equal angles and side lengths |
Number of sides on a triangle | 3 |
Number of sides on a quadrilateral | 4 |
Number of sides on a pentagon | 5 |
Number of sides on a hexagon | 6 |
Number of sides on a heptagon | 7 |
Number of sides on a octagon | 8 |