Pre-AlgebraScale Drawings

Scale Drawings

Learn how to create and interpret scale drawings, and understand their real-world applications.

Understanding Scale Drawings

What is a Scale Drawing?

  • A proportional representation of an actual object or place
  • Uses a scale factor to show larger or smaller versions
  • Maintains the same shape and proportions as the original
  • Common in maps, blueprints, and technical drawings

Scale Ratios

  • Written as a ratio (1:50) or fraction (1/50)
  • First number represents the drawing measurement
  • Second number represents the actual measurement
  • Example: 1 inch on paper = 50 inches in reality

Making Scale Drawings

  • Choose an appropriate scale
  • Convert actual measurements using the scale
  • Draw accurately using converted measurements
  • Include a scale key or legend

Real-World Applications

  • Architecture and construction plans
  • Maps and geography
  • Engineering drawings
  • Model making and design

Practice Problems

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Quick Tips

  • Always include units when working with scale drawings.
  • Check that your calculations make sense in the real world.
  • Keep track of which measurements are from the drawing and which are actual.