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- 1. Welcome to the World of Polygons!
- 2. Polygons <ul><li>The word polygon means “many angles” </li></ul><ul><li>A two dimensional object </li></ul><ul><li>A closed figure </li></ul>
- 3. More about Polygons <ul><li>Made up of three or more straight line segments </li></ul><ul><li>There are exactly two sides that meet at a vertex </li></ul><ul><li>The sides do not cross each other </li></ul>
- 4. Examples of Polygons
- 5. These are not Polygons
- 6. Terms: Side: One of the line segments that make up a polygon. Vertex: point where two sides meet.
- 7. <ul><li>Regular Polygon: a polygon where all the angles are equal and all of the sides are the same length. They are both equilateral and equiangular </li></ul>
- 8. Examples of Regular Polygons
- 9. Types of Polygons
- 10. Triangle <ul><li>A triangle has three sides. </li></ul>1 2 3
- 11. Everyday triangles…
- 12. There are several types of triangles
- 13. <ul><li>Isosceles Triangles have 2 equal sides. </li></ul><ul><li>Equilateral Triangles have 3 equal sides </li></ul><ul><li>Scalene Triangles have no equal sides </li></ul>
- 14. <ul><li>Acute triangles have 3 acute angles </li></ul><ul><li>Obtuse triangles have 1 obtuse angle </li></ul><ul><li>Right triangles have 1 right angle </li></ul>
- 15. Quadrilateral <ul><li>A quadrilateral has four sides. </li></ul>
- 16. Square <ul><li>Squares have 4 equal parallel sides and 4 right angles. </li></ul><ul><li>Squares are regular polygons </li></ul>
- 17. Everyday Squares
- 18. Rectangles <ul><li>Rectangles have parallel sides that are equal to each other. </li></ul><ul><li>All angles are right angles. </li></ul>
- 19. Everyday Rectangles
- 20. Rhombus <ul><li>A rhombus has four equal parallel sides. </li></ul>
- 21. Parallelogram <ul><li>Parallelograms have opposite equal parallel sides </li></ul>
- 22. Everyday Parallelograms
- 23. Trapezoid <ul><li>Trapezoids have one set of parallel sides. </li></ul>
- 24. Everyday Trapezoids
- 25. Pentagon <ul><li>A pentagon has five sides. </li></ul>1 2 3 4 5
- 26. Everyday Pentagons
- 27. Hexagon <ul><li>A hexagon has six sides. (Hexagon and six both have an “x”.) </li></ul>
- 28. Everyday Hexagons
- 29. Heptagon <ul><li>A heptagon has seven sides. </li></ul>
- 30. Everyday Heptagons
- 31. Octagon <ul><li>An octagon has eight sides. Count the sides. </li></ul>If this octagon was red and had the word “Stop” written on it, then you would know where we see a lot of octagons.
- 32. Everyday Octagons
- 33. Nonagons <ul><li>Nonagons have nine sides </li></ul>
- 34. Everyday Nonagons
- 35. Decagon <ul><li>Decagons have 10 sides. </li></ul>
- 36. Everyday Decagons
- 37. Hendecagon <ul><li>Hendecagons have 11 sides </li></ul>
- 38. Everyday Hendecagons
- 39. Dodecagons <ul><li>Dodecagons have 12 sides </li></ul>
- 40. Everyday Dodecagons
- 41. <ul><li>A triangle is the smallest polygon because it has three sides. Can you have a two-sided polygon? Why or why not? </li></ul>Two lines don’t close to make a shape. They make an angle. 2 1 Key Question:

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