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Polygonau Siapau Gyda Llinellau Syth
Enghreifftiau o Bolygonau
Nid yw siapau hyn yn bolygonau
Enghreifftiau o bolygonau rheolaidd –  Pob ochr yr un hyd
Types of Polygons
Triangle <ul><li>A triangle has three sides. </li></ul>1 2 3
Everyday triangles…
There are several types of triangles
<ul><li>Isosceles Triangles have 2 equal sides. </li></ul><ul><li>Equilateral Triangles have 3 equal sides </li></ul><ul><...
<ul><li>Acute triangles have 3 acute angles </li></ul><ul><li>Obtuse triangles have 1 obtuse angle </li></ul><ul><li>Right...
Quadrilateral  <ul><li>A quadrilateral has four sides. </li></ul>
Square <ul><li>Squares have 4 equal parallel sides and 4 right angles. </li></ul><ul><li>Squares are regular polygons </li...
Everyday Squares
Rectangles <ul><li>Rectangles have parallel sides that are equal to each other. </li></ul><ul><li>All angles are right ang...
Everyday Rectangles
Rhombus <ul><li>A rhombus has four equal parallel sides. </li></ul>
Parallelogram <ul><li>Parallelograms have opposite equal parallel sides </li></ul>
Everyday Parallelograms
Trapezoid <ul><li>Trapezoids have one set of parallel sides. </li></ul>
Everyday Trapezoids
Pentagon <ul><li>A pentagon has five sides. </li></ul>1 2 3 4 5
Everyday Pentagons
Hexagon  <ul><li>A hexagon has six sides.  (Hexagon and six both have an “x”.) </li></ul>
Everyday Hexagons
Heptagon <ul><li>A heptagon has seven sides. </li></ul>
Everyday Heptagons
Octagon <ul><li>An octagon has eight sides.  Count the sides. </li></ul>If this octagon was red and had the word “Stop” wr...
Everyday Octagons
Nonagons <ul><li>Nonagons have nine sides </li></ul>
Everyday Nonagons
Decagon <ul><li>Decagons have 10 sides. </li></ul>
Everyday Decagons
Hendecagon <ul><li>Hendecagons have 11 sides </li></ul>
Everyday Hendecagons
Dodecagons <ul><li>Dodecagons have 12 sides </li></ul>
Everyday Dodecagons
<ul><li>A triangle is the smallest polygon because it has three sides.  Can you have a two-sided polygon?  Why or why not?...
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Polygonau

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Cyflwyniad i bolygonau ar gyfer blwyddyn 7

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Transcript of "Polygonau"

  1. 1. Polygonau Siapau Gyda Llinellau Syth
  2. 2. Enghreifftiau o Bolygonau
  3. 3. Nid yw siapau hyn yn bolygonau
  4. 4. Enghreifftiau o bolygonau rheolaidd – Pob ochr yr un hyd
  5. 5. Types of Polygons
  6. 6. Triangle <ul><li>A triangle has three sides. </li></ul>1 2 3
  7. 7. Everyday triangles…
  8. 8. There are several types of triangles
  9. 9. <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>
  10. 10. <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>
  11. 11. Quadrilateral <ul><li>A quadrilateral has four sides. </li></ul>
  12. 12. Square <ul><li>Squares have 4 equal parallel sides and 4 right angles. </li></ul><ul><li>Squares are regular polygons </li></ul>
  13. 13. Everyday Squares
  14. 14. Rectangles <ul><li>Rectangles have parallel sides that are equal to each other. </li></ul><ul><li>All angles are right angles. </li></ul>
  15. 15. Everyday Rectangles
  16. 16. Rhombus <ul><li>A rhombus has four equal parallel sides. </li></ul>
  17. 17. Parallelogram <ul><li>Parallelograms have opposite equal parallel sides </li></ul>
  18. 18. Everyday Parallelograms
  19. 19. Trapezoid <ul><li>Trapezoids have one set of parallel sides. </li></ul>
  20. 20. Everyday Trapezoids
  21. 21. Pentagon <ul><li>A pentagon has five sides. </li></ul>1 2 3 4 5
  22. 22. Everyday Pentagons
  23. 23. Hexagon <ul><li>A hexagon has six sides. (Hexagon and six both have an “x”.) </li></ul>
  24. 24. Everyday Hexagons
  25. 25. Heptagon <ul><li>A heptagon has seven sides. </li></ul>
  26. 26. Everyday Heptagons
  27. 27. 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.
  28. 28. Everyday Octagons
  29. 29. Nonagons <ul><li>Nonagons have nine sides </li></ul>
  30. 30. Everyday Nonagons
  31. 31. Decagon <ul><li>Decagons have 10 sides. </li></ul>
  32. 32. Everyday Decagons
  33. 33. Hendecagon <ul><li>Hendecagons have 11 sides </li></ul>
  34. 34. Everyday Hendecagons
  35. 35. Dodecagons <ul><li>Dodecagons have 12 sides </li></ul>
  36. 36. Everyday Dodecagons
  37. 37. <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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