lesson 19 computing actual areas from a scale drawing
TRANSCRIPT
![Page 1: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/1.jpg)
Lesson 19Computing Actual Areas from a Scale
Drawing
![Page 2: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/2.jpg)
Review
What is the difference between scale and scale factor?
![Page 3: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/3.jpg)
Examples 1–3: Exploring Area Relationships
Use the diagrams below to find the scale factor and then find the area of each figure.
Example 1
Scale factor: _________ Actual Area = ______________ Scale Drawing Area = ________________ Ratio of Scale Drawing Area to Actual Area: _________
![Page 4: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/4.jpg)
Example 2
Scale factor: _________
Actual Area = ______________ Scale Drawing Area = ________________ Ratio of Scale Drawing Area to Actual Area: _________
![Page 5: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/5.jpg)
Example 3
Scale factor: _________ Actual Area = ______________ Scale Drawing Area = ________________ Ratio of Scale Drawing Area to Actual Area: _________
![Page 6: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/6.jpg)
![Page 7: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/7.jpg)
Why do you think it is squared as opposed to cubed or something else?
How might you use this information I working with scale drawings?
Suppose a rectangle has an area of 12 square m. If it is enlarged by a scale factor of three, what area would you predict the enlarged rectangle to have based on what you just concluded?
![Page 8: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/8.jpg)
![Page 9: Lesson 19 Computing Actual Areas from a Scale Drawing](https://reader036.vdocument.in/reader036/viewer/2022082819/56649f2a5503460f94c43c42/html5/thumbnails/9.jpg)