6-8 scale drawings how did they do that????. scale drawing/model used to represent objects too...

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6-8 Scale Drawings How did they do that????

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Page 1: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

6-8 Scale DrawingsHow did they do that????

Page 2: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

Scale Drawing/ModelUsed to represent objects too large or too small to be drawn or built in actual size

All measurements are proportional ? What does proportional mean again?

Page 3: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

ScaleRatio that compares the measurements of the drawing (1st) to the actual measurements (2nd)

or

Page 4: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

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. Place a variable (x) for what you don’t know. Match up all units!

Step three: cross multiply and solve for the variable (x).

Page 5: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

Another Example: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?

Page 6: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

Another Example: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)

Page 7: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

Scale FactorA scale written as a ratio without unitsTells how much bigger the actual thing is

Step one: Make both units the sameStep two: Now you can leave off the units

Ex: 1 inch : 3 feet12 inches = 1 foot…… so …… 3(12) = 36 inches.

1 : 36 … this means the second number is 36 times bigger than the first.

Page 8: 6-8 Scale Drawings How did they do that????. Scale Drawing/Model  Used to represent objects too large or too small to be drawn or built in actual size

Find the scale factor! And then find out how much bigger it is?

Ex: 2 cm to 10 m

Ex: 6 inches to 1 foot

Ex: 2 inches : 15 feet