1. I Can Solve Problems Using Scale Drawings!

2. I Can Solve Problems Using Scale Drawings!
Some new words we will encounter:
Scale
Scale drawing
Scale model

3. I Can Solve Problems Using Scale Drawings!
We know about scales at the supermarket. They measure weight.
They show the relationship between how much you are buying and how much you have to pay.

4. I Can Solve Problems Using Scale Drawings!
We also know about the scales we stand on. They measure our weight.
They help to show the relationship between our health and what we eat.

5. I Can Solve Problems Using Scale Drawings!
In math, scale shows the relationship between two things as well.
With maps, it is usually between a distance measured on the map and the actual distance on the ground.

6. I Can Solve Problems Using Scale Drawings!
Suppose the distance between Coral Springs and Fort Lauderdale is about 4.1 centimeters on the map.
What is the actual distance on the ground if the scale is 1 cm = 4.5 km?

7. I Can Solve Problems Using Scale Drawings!
Use the scale as a fraction.
Use cross-products to calculate.

8. I Can Solve Problems Using Scale Drawings!
A scale drawing represents something that is too large or too small to be drawn at its actual size.
Maps and blueprints are examples of scale drawings.

9. I Can Solve Problems Using Scale Drawings!
The blueprint of the pool shows each square has a side length of ¼ inch.
If the scale is written as ¼ in = 2 ft, what is actual width of the pool?
(To figure this out, what else do you need to know?)

10. I Can Solve Problems Using Scale Drawings!
Width of the pool on the blueprint = inches.
How can you use cross products to figure out how wide the pool really is?

11. I Can Solve Problems Using Scale Drawings!

12. I Can Solve Problems Using Scale Drawings!
If you know the actual length of an object and you know the scale, you can build a scale model.
Scale models (3-D) are used to represent things that are too large or too small for an actual-size model.
Examples are cars, planes, trains, rockets, computer chips, heart cells, bacteria.

13. I Can Solve Problems Using Scale Drawings!
Designers are creating a larger model of a computer memory board to use in design work. The board measures 5 ¼ inches in length.
If they use a scale of 20 inches = 1 inch, what is the length of the model?

14. I Can Solve Problems Using Scale Drawings!
Things to remember:
When solving proportions, give your answer in the correct unit of measurement.
Scale is the ratio between the drawing/model measurement to the actual measurement.
Not always the ratio of smaller to larger!

15. I Can Solve Problems Using Scale Drawings!
What are your questions about Scale Drawings?