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Understanding Scale Drawings and Ratios in Blueprint Design

Learn about scale drawings, ratios, and scale factors in blueprint design. Discover how scale drawings represent real objects and how to calculate scale factor for enlargements and reductions. Examples provided.

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Understanding Scale Drawings and Ratios in Blueprint Design

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  1. Ratios of Scale drawings

  2. Scale drawings: • A scale drawing is a drawing that represents a real object. The scale of the drawing is the ratio of the size of the drawing to the actual size of the object. • Examples: blueprints and maps.

  3. Scale factor: • The scale factor is the ratio of the new image size to the corresponding old image size. • Example: If a model car has a scale factor of 1/10 , then a part that is 1 cm on the model would be 10 cm on the real car.

  4. Two types of scale drawings: • Enlargement- a drawing with a scale factor greater than 1. The image is larger than the original figure. • Reduction- a drawing with a scale factor less than 1. The image is smaller than the original figure.

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