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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
• 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
• 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: