4.2 scale diagrams

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  • 1. 4.2ScaleDiagrams 1 May16,2014 4.2Scale Diagram s Homework page 143 47, 1011, 1314, 21

2. 4.2ScaleDiagrams 2 May16,2014 3. 4.2ScaleDiagrams 3 May16,2014 Scale A comparison between the actual size of an object and the size of its diagram. Can be expressed as a ratio, as a fraction, as a percent, in words, or in a diagram. We can calculate the scale using the following formula: scale = diagram measurement actual measurement 4. 4.2ScaleDiagrams 4 May16,2014 Reading Scale What does a scale of 1:32 mean? 5. 4.2ScaleDiagrams 5 May16,2014 Car manufacturers create scale drawings that show what a new car will look like. This car is drawn to a scale of 1/40. What does that mean? 6. 4.2ScaleDiagrams 6 May16,2014 Scale Diagrams A drawing that is similar to the actual figure or object May be smaller or larger than the actual object, but must be in the same proportions 7. 4.2ScaleDiagrams 7 May16,2014 Determine the scale factor for each enlargement or reduction. a) from A to B (from scale to actual) b) from A to C c) from B to C d) from C to A e) from C to B 8. 4.2ScaleDiagrams 8 May16,2014 The scale for the diagram of this fish is 1:9.2. What is the actual length of the fish? 5 cm 9. 4.2ScaleDiagrams 9 May16,2014 The flying distance from Dawson City to Whitehorse is 540 km. The distance shown on the map is 3 cm. Complete the scale in words. scale: 1 cm represents ____ km If the distance from Winnipeg to Saskatoon on a map is 4.2 cm using the scale above, what is the actual distance from Winnipeg to Saskatoon? 10. 4.2ScaleDiagrams 10 May16,2014 How can you check that the larger image of the airliner is proportional to the dimensions in the original photo? Try out a method. Discuss! 11. 4.2ScaleDiagrams 11 May16,2014 Create a scale diagram of our classroom if it measures 800 cm by 750 cm. Now estimate the dimensions of the desk, tables, filing cabinets and shelves. Add these to your scale diagram above. Scale: 1cm = _____ cm