Triangles & Quadrilaterals
| __ | 1. | Acute | | A. | A triangle with 2 equal sides and angles. | | __ | 2. | Equilateral | | B. | A closed shape with four sides. | | __ | 3. | Isosceles | | C. | A triangle with 3 equal sides and angles. | | __ | 4. | Obtuse | | D. | A triangle with 3 different side lengths. | | __ | 5. | Quadrilateral | | E. | A triangle with angles less that 90º. | | __ | 6. | Rectangle | | F. | A triangle with an angle more than 90º but less than 180º. | | __ | 7. | Right | | G. | A triangle with a right angle. Must have box indicating righ | | __ | 8. | Scalene | | H. | a meeting point of two lines that form an angle | | __ | 9. | Square | | I. | All sides are the same. All angles are right angles. | | __ | 10. | Vertex | | J. | Opposite sides are parallel. All angles are right angles. |
| __ | 11. | 3 sides | | A. | Opposite sides are equal. Opposite angles are equal. Opposit | | __ | 12. | 4 | | B. | The 4 interior angles of a quadrilateral add up to 360º. It | | __ | 13. | 5 | | C. | A quadrilateral with no parallel sides. | | __ | 14. | 6 | | D. | To find the interior angle sum of any shape (n-2)180. Or, st | | __ | 15. | 7 | | E. | Quadrilateral | | __ | 16. | 8 | | F. | Triangle | | __ | 17. | interior angle sum | | G. | Pentagon | | __ | 18. | Parallelogram | | H. | Octagon | | __ | 19. | Quadrilateral | | I. | Hexagon | | __ | 20. | Trapezium | | J. | Heptagon |
| __ | 21. | 9 | | A. | Decagon | | __ | 22. | 10 | | B. | An angle that measures 180 degrees, a straight line. | | __ | 23. | Concave | | C. | Undecagon, an angle greater than 180 degrees (but less than | | __ | 24. | Convex | | D. | Nonagon | | __ | 25. | Irregular Polygon | | E. | A polygon with no reflex angle, all vertices appear to be pu | | __ | 26. | reflex angle | | F. | A polygon with a reflex angle, curved inward, creating a hol | | __ | 27. | Regular Polygons | | G. | Same sides, same lengths. | | __ | 28. | straight angle | | H. | The sides are different lengths. |
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