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Perimeters basic

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  • 1. Construction NumeracyCalculating Perimeters: Basic Shapes Stonemasonry Department 2012
  • 2. Perimeter ‘Perimeter is the distance around a two dimensional shape, or the measurement of the distance around something; the length of the boundary.’ Wikipedia 2012
  • 3. Perimeter of a Square 5m Perimeter = 5 + 5 + 5 + 5 Perimeter = 20m 5m 5m or Perimeter = 5 x 4 Perimeter = 20m 5m To calculate the perimeter of a square we add the lengths of each of the four sides. Because the sides of a square have identical lengths we can use the following formula: Perimeter of a Square = Length of One Side x 4
  • 4. Perimeter of a Square 6m Perimeter = Length of one side x 4 6m Perimeter = 7m Perimeter = Length of one side x 4 7m Perimeter =
  • 5. Perimeter of a Square 3m Perimeter = Length of one side x 4 3m Perimeter = 9.4m Perimeter = Length of one side x 4 9.4m Perimeter =
  • 6. Perimeter of a Rectangle 6m Perimeter = 6 + 4 + 6 + 4 4m Perimeter = 20m To calculate the perimeter of a rectangle we add the lengths of all four sides. Remember to use the correct unit of measurement when displaying your answer (e.g. m, mm, cm, km)
  • 7. Perimeter of a Rectangle 8m P = Side 1 + Side 2 + Side 3 + Side 4 6m Perimeter = 9m P = Side 1 + Side 2 + Side 3 + Side 4 8m Perimeter =
  • 8. Perimeter of a Rectangle 3m P = Side 1 + Side 2 + Side 3 + Side 4 2m Perimeter = 5.2m P = Side 1 + Side 2 + Side 3 + Side 4 3m Perimeter =
  • 9. Perimeter of a Triangle Perimeter = Side 1 + Side 2 + Side 3 6m 6m Perimeter = 6 + 6 + 6 Perimeter = 18m 6m To calculate the perimeter of a triangle you add the lengths of each of the three sides. You cannot assume that each side will have the same length so check your answer carefully.
  • 10. Perimeter of a Triangle Perimeter = Side 1 + Side 2 + Side 3 4m 4m Perimeter = 4m 8m Perimeter = Side 1 + Side 2 + Side 3 8m Perimeter = 6m
  • 11. Perimeter of a Triangle Perimeter = Side 1 + Side 2 + Side 3 9m 9m Perimeter = 8m 7m Perimeter = Side 1 + Side 2 + Side 3 7m Perimeter = 8m
  • 12. Perimeters of Complex Shapes Perimeters are commonly used in the construction industry and often the shapes we measure the perimeter of are not perfect squares, rectangles and triangles but a combination of a number of them. Can you calculate the perimeter of the shape shown above?
  • 13. References The image on the title slide of this presentation was sourced from Eric Gjerde’s photostream at: http://images.cdn.fotopedia.com/flickr-153047995-hd.jpg This image was made available under creative commons The definition of perimeter was sourced from wikipedia at: http://en.wikipedia.org/wiki/Perimeter
  • 14. Developed by The Stonemasonry Department City of Glasgow College 2012

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