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Polygons powerpoint

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Transcript

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

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