1. Scale Drawings

2. Scale Drawing: a reduced or enlarged two- dimensional drawing of an original two- dimensional drawing.

3. For the following problems, (a) is the actual picture and (b) is the scale drawing. Is the scale drawing an enlargement or a reduction of the actual picture? EnlargementReduction

4. HeightLength Original Drawing Second Drawing Celeste drew an outline of a building for a diagram she was making and then drew a second one mimicking her original drawing. Fill out the table and determine if the second image is a scale drawing of the original image. Original Second Drawing 18 units 6 units 9 units 3 units

5. a. If the original lengths are multiplied by 2, what are the new coordinates? b.Use the table to the right to organize the lengths. c. Is the new picture a reduction or an enlargement? d. What is the constant of proportionality? LengthHeight Actual Picture Lengths (in units) New Picture Lengths (in units) Try this one! (0,0), (12,18), (12,0) 6 units 9 units 12 units18 units Enlargement 2

6. Use a Scale Factor of 3 to create new dimensions to make a scale drawing of the Flag of Columbia below.

7. Hint: Making a ratio table will help scale equivalent scale ratio surfboard Scale Drawing Length, x Actual Length, y?

8. Area Scale factor from first object to second: _________ Actual Area = ______________ Scale Drawing Area = ________________ Ratio of Scale Drawing Area to Actual Area: _________ 54 square units 6 square units

9. Finding the Scale A museum is creating a full-size Tyrannosaurus Rex for a model. The model is 40 inches in length, from the nose to the tail. The resulting dinosaur will be 40 feet in length. What is the model’s scale? Solution Write a ratio with the model on top and the full size on bottom. Make sure that both measures are in inches. Then simplify the fraction. == scale model full size

12. Practice: Scale Drawing Day 1 worksheet