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6-8 Scale Drawings

6-8 Scale Drawings. Scale Drawing/Model. Used to represent objects too large or too small to be drawn or built in actual size All measurements are proportional. Scale. Ratio that compares the measurements of the drawing (1 st ) to the actual measurements (2 nd ) or . Using Proportions!.

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6-8 Scale Drawings

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  1. 6-8 Scale Drawings

  2. Scale Drawing/Model • Used to represent objects too large or too small to be drawn or built in actual size • All measurements are proportional

  3. Scale • Ratio that compares the measurements of the drawing (1st) to the actual measurements (2nd) • or

  4. Using Proportions! • The length of a football field is 120 yards. The scale is 1 in = 20 yd. What is the length of the model football field? • Step one: Write the scale as a ratio. • Step two: Fill in what you know. Match up all units!

  5. The length of a model airplane is 11.6 inches. The scale is 2 inches for every 15 feet in real life. • What is actual length of the airplane? Another Example:

  6. A scooter is 3.5 feet long. Find the length of a scale model of the scooter if the scale is 1 inch = 24 inches. • hint= you must convert ft to inches. • (12 inches = 1 foot) Another Example:

  7. Scale Factor • Step one: Make both units the same • Step two: Now you can leave off the units • A scale written as a ratio without units • Tells how much bigger the actual thing is • Ex: 1 inch : 3 feet • 12 inches = 1 foot…… so …… 3(12) = 36 inches. • 1 : 36… this means the secondnumber is 36times bigger than the first.

  8. Find the scale factor! • Ex: 2 cm to 10 m • Ex: 6 inches to 1 foot • Ex: 2 inches : 15 feet

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