1. Scale Drawings
7.G.1 Solve problems involving scale drawings of geometric figures, including computing actual lengths and areas from a scale drawing and reproducing a scale drawing at a different scale
7.RP.1 Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in each 1/4 hour, compute the unit rate as the complex fraction (1/2)/(1/4) miles per hour, equivalently 2 miles per hour

2. Bell Work

3. Lesson Objectives Understand that a scale is ratio.
Computer actual lengths from a scale drawing involving geometric figures.
Compute actual areas from a scale drawing involving geometric figures.
Reproduce a scale drawing using a different scale.
Determine the scale of a drawing given the ratios of lengths and areas in the drawing and the actual dimensions

4. Prerequisite skills Write and solve a proportion.
Draw geometric figures given specifications
Find the perimeter and area of geometric shapes

5. Vocabulary
SCALE DRAWING – a drawing that shows an objet with its measurement in proportion to the actual measurements of the object.
SCALE: a ratio that compares the measurements
used in a scale drawing with the actual
measurements.
SCALE FACTOR: a constant of proportionality

6. Scale Drawings

7. Set up proportions for the following:
Your Turn: Page 167 in your NC Ready Book

8. Solving Scale Drawings Using Figures

10. Together:

11. Your Turn:

12. Lets Try another:

13. What is scale?

14. When do we use scale drawings

16. Lets Try some

18. Another Example

19. Partner time

20. One More With a Partner

21. What Do you Think?

22. Your Turn On Your Own:

29. Resources: Ready Common Core Mathematics by Curriculum Associates
NC Ready Mathematics
cts/ready-north-carolina-mathematics.aspx
NCDPI – Released Tests