Using ratios in scale drawing

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Transcript

  • 1. SCale
  • 2. SCale SCale
  • 3. SCale SCale SCale
  • 4. SCale SCale SCale
  • 5. A scale is a ratio of size in a map, model, plan or drawing. Ratios are a way to compare two numbers or quantities.
  • 6. 2cm 2cm
  • 7. 4cm 4cm
  • 8. 4cm2cm 2cm 4cm Scale: 1cm = 2 cm Ratio: 1: 2
  • 9. 4cm 4cm
  • 10. 12cm 12cm
  • 11. 12cm4cm 4cm 12cm Scale: 1cm = 3 cm Ratio: 1: 3
  • 12. 15cm 10cm
  • 13. 3cm 2cm
  • 14. 15cm 3cm 2cm 10cm Scale: 5 cm = 1 cm Ratio: 5:1
  • 15. Now it’s your turn!Use Keynote to scale some images.Here’s how:1. Open Keynote2. Create a shape.3. Use the Inspector to make sure the length andwidth is a whole number.4. Decide on a scale you want to use.5. Duplicate the shape.6. Use your scale to enlarge or reduce the shapeusing the Inspector.