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# Perimeters basic

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### Perimeters basic

1. 1. Construction NumeracyCalculating Perimeters: Basic Shapes Stonemasonry Department 2012
2. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 14. Developed by The Stonemasonry Department City of Glasgow College 2012